1. Yes, it does. The laws of reflection are: i. The incident ray is equal to the reflected ray. ii. The normal, incident ray, reflected ray drawn at the point of incidence lie on the same plane. 2. In small rooms, The distance between dource and reflecting surface is not 17m but smaller than that. Due to which echo is not heard in these small places. 3. 1st echo: T=0.3s D=2d S≈340m/s 340=2d×10/3 D=51 m 2nd echo, D=2d T=0.5s S≈340 m/s 340=2d×10/5 D=85 m Total distance =51+85 =136 m
@sourare8206
8 ай бұрын
Your answers are smart
@SrijitaSahaOfficial
8 ай бұрын
@sourare8206 thanks mate
@abdul-majeedyakubu9813
2 жыл бұрын
Q1. Yes. The laws of reflection of sound are. 1. The incident angle is equal to the reflected angle. 2. The incident ray the reflected ray and the normal ray all lie on the same plane. Q2 Because the room is small. Q3. Distance=speed X time. First echo distance. 2d=340m/s X 0.3s 2d=102 d =51m Second echo distance 2d=340m/s X 0.5 2d=170 d=85m. Total distance=51m + 85m Total distance=136m
@BlastyaBihan
Жыл бұрын
i think second echo should be 4d becoz it is coming to us back going and coming back to us once again......Prove me wrong...
@SrijitaSahaOfficial
11 ай бұрын
@@BlastyaBihanno. They are 2 different echosm
@legendsshorts_101
2 жыл бұрын
Sir you always teach in a proper and easy way.Thank you for this video.It helped me a lot.
@MariaShikololo
Жыл бұрын
U are good teacher I ever seen in my life 😢
@ManochaAcademy
Жыл бұрын
Thanks for liking
@dishatarkar6819
8 ай бұрын
Best channel for physics So simple videos 😊
@ashishbabu6494
5 жыл бұрын
Thanks for ur video sir...I really Loved it... Q1.yes,the law of reflection is the angle of the incident ray is equal to angle of reflected ray Q2.because ,the distance should atleast 17 m to hear the echo Q3.31 m
@ManochaAcademy
5 жыл бұрын
Happy to hear that you liked the video! Thanks :) Do check out more videos at www.manochaacademy.com Q1 and Q2 are correct! Q1 you can also write the 2nd law: incident sound, reflected sound and the normal all lie on the same plane. Q3, answer should be 136 m. Here is the solution: For this question, draw a rough diagram of a man standing between two hills. Let the distance of one hill from the man be 'a' and other hill from man is 'b'. So total distance between to hills is 'a + b'. As discussed in video, for echo since sound travels twice the distance, formula is: 2d = speed x time, where d is the distance. Since it's not given in the sum, you can take speed of sound in air as 340 m/s (or any standard value that you use). Now consider each hill separately: For first time t1 = 0.3 s, we can do 2a = 340 x 0.3. So a = 51 m For 2nd time t2 = 0.5 s, we can do 2b = 340 x 0.5. So b = 85 m So total distance = a + b = 136 m. Let me know if it is clear now!
@manjularamesh5663
Жыл бұрын
Hello sir why you've taken distance as 2d ?? You are the best physics teacher and i love physics. Thanks for making this chapter crystal clear to me sir. 😊😊
@tiktokworld84
11 ай бұрын
Because when the sound goes, it is reflected (comes back) So we use d+d=2d
@shivashiv8173
5 жыл бұрын
1; yes (I) angle of incident ray = angle of reflection (Ii) the incident ray, the reflected ray and the normal line lies in the sand plane 2; we can't hear echoes in a smile room because there is no at least distance between two distinct sounds or there is no time gap between two distinct sounds 3; the distance between two hills is 59.5 m when speed of sound in air is 340m/s... According to ur video sir actual speed of sound in air is 331 m/ s at 0° c when rise temperature of medium the speed varies because when temperature increase kinetic energy of medium increases tq sir...
@ManochaAcademy
5 жыл бұрын
Very good! Q1 and Q2 are correct :) Q3) Answer should be 136m. See the solution below. For this question, draw a rough diagram of a man standing between two hills. Let the distance of one hill from the man be 'a' and other hill from man is 'b'. So total distance between to hills is 'a + b'. As discussed in video, for echo since sound travels twice the distance, formula is: 2d = speed x time, where d is the distance. Since it's not given in the sum, you can take speed of sound in air as 340 m/s (or any standard value that you use). Now consider each hill separately: For first time t1 = 0.3 s, we can do 2a = 340 x 0.3. So a = 51 m For 2nd time t2 = 0.5 s, we can do 2b = 340 x 0.5. So b = 85 m So total distance = a + b = 136 m.
@shreyanchakraborty1877
3 жыл бұрын
Sir I didn't know the meaning of bathroom singers... Can you pls make me understand it
@ThomasMampilly-rq3dt
7 ай бұрын
Then 2 The surfaces are small that the reflection of sound would reach back to you before 0.1 seconds. Therefore you cant hear the echoes
@Jignesh0890
7 ай бұрын
And also, The Minimum Distance should be 17m to hear a Echo
@jaanvidesai4417
3 жыл бұрын
The explanation was so nice i liked the video so much and i learned this without any doubt From Taanvi Desai
@ManochaAcademy
3 жыл бұрын
Thanks a lot 😊
@shaarushivani936
3 жыл бұрын
Exam revision vdos. Super cool teaching. Keep teaching sir.👍👌👌👍🏿
@ManochaAcademy
3 жыл бұрын
Thank you, I will
@rekhachavanpatole5547
Жыл бұрын
I learn so many things from you... And get many kinds of activities.... Teaching ideas ...thanks alot
@krishnamacha861
4 жыл бұрын
Such a amazing teacher
@ManochaAcademy
4 жыл бұрын
Thanks
@akokojaber9831
4 жыл бұрын
@@ManochaAcademy how do i get the video of the questions
@nneamakaqueendaline5310
2 жыл бұрын
1)The incident Ray and angle of reflection are equal. Also, the incident Ray, angle of reflection and normal, all lie on thesame plane.
@ronitvaghela9b627
2 жыл бұрын
Best teacher ever
@financebro2453
3 жыл бұрын
THIS VIDEO REALLY HELPFUL FOR MY ""SEMINAR "" V. THANK YOU SIR 🔥🔥
@ManochaAcademy
3 жыл бұрын
Most welcome
@ritaprajapati3215
4 жыл бұрын
Sir how to find the 3rd one please tell me you had said that you will clear all the doubt's
@_123.3
Жыл бұрын
You are a great teacher
@versatilelens
3 жыл бұрын
Best sir in the multiverse
@AliMohamed-vh4fz
10 ай бұрын
Is the answer 85+51=136 in no 3??
@ganeshr7283
7 ай бұрын
Yes u are right👍👍
@paromitadebnath883
4 жыл бұрын
Ans 1. Yes, sound obey the laws of reflection The types of laws of reflection are as follows. a) the incident ray , the reflected ray, and the normal all lies at the same plane b) the angle of incidence is equal to the angle of reflection Ans 2. An echo needs a minimum space to reflect , a small room has not much space, so an echo cannot be hear in a small room Ans 3. The distance should be 136 mitre
@paromitadebnath883
4 жыл бұрын
Sorry i had written the 3rd answer wrong i thing it will be 34m
@pallavitammina5489
3 жыл бұрын
I like every video from your channel
@ramjeevan3588
3 жыл бұрын
Answers.... 1. Incident sound = reflected sound. 2. Because echoes occurs in huge open space that is why it's impossible to occur echoes in a small room.
@laksheesh47
Жыл бұрын
Sir, why do we assume 340m/s for finding the minimum distance needed for hearing a echo?
@faahidthesiuman
Жыл бұрын
that's because it's proven that the speed of sound in air is 340m/s
@a.narendranath7587
Жыл бұрын
No itz becoz sounds travels at 340m/s at room temperature that's is 22°C. The speed of the sound depends on the temperature
@chandnivermaa3807
Жыл бұрын
Because sound is travelling in air in most of the cases
@parasgalar4785
4 жыл бұрын
Best teacher
@ManochaAcademy
4 жыл бұрын
Thanks
@Musakhan-dl7qq
2 ай бұрын
You are the best teacher ❤
@077di6
4 жыл бұрын
thank you, please correct me? 1. yes, but i didn't understand the laws you need to be good at math maybe? 2. Eco measure with time*speed=distanse, the longer the distance the eco is bigger, it's need to be minimum 0.1 sec in the equation outcome, in small rooms it's less than 0.1 to reflection so it's not having eco? ?3. how can you solve equation when you have only one parameter?0.3= X*Y
@tejads3778
4 жыл бұрын
Take avg speed of the light 340m\s
@sandhyaponna7800
Жыл бұрын
Sir your explanation is really good and I understood It very clearly
@angel__14370
2 жыл бұрын
Can you make a video on Characteristics os Sound Waves
@OlalekanToluwani
3 ай бұрын
The first law of reflection states that the incident ray ,normal ray and reflected ray all lies in the same plane The second law of reflection of sounds states that the angle of reflection is equal to the angle of incidence
@8hdharshans707
Жыл бұрын
Best teacher which school your teaching
@devanshsrivastava5994
4 жыл бұрын
Thnx for your great effort.
@ManochaAcademy
4 жыл бұрын
Our pleasure!
@poornimap4989
Жыл бұрын
Thank you so much sir for your wonderful teaching
@jollytwahiirwa3746
27 күн бұрын
Sir weldone I need Yr guide on waves please coz iam not getting it well.thanks
@allyrhophloem9191
2 жыл бұрын
Echo increases with the increase in the distance between the source of the sound and the surface of the source of reflection of sound
@allyrhophloem9191
2 жыл бұрын
1. Yes, the angle of incidence is equal to the angle of reflection. The normal, the incident sound and the reflected sound at the point of incidence all lie on the same plane
@kingofdemon9758
4 жыл бұрын
Very nice teaching sir you are really great.
@mhkfortunatemedicoslecture7091
2 жыл бұрын
136m
@brunohaonaga9079
5 жыл бұрын
Umm very interesting...👍
@ManochaAcademy
5 жыл бұрын
Thank you :)
@mrsaiyambro
Жыл бұрын
We can't hear an echo in a small room because the minimum distance between the source and reflecting object should be for an echo to be heard
@kirthi_kanakesh_6314
2 жыл бұрын
Thank you
@goldeeshorts7036
2 жыл бұрын
Q 1. The law of reflection are: Angle incidence = angle reflection Q 2. Because there is no time gap
@harshrj6030
3 жыл бұрын
Thanks a lotttttttttttttt sir
@ManochaAcademy
3 жыл бұрын
Welcome
@malatimalati8062
3 жыл бұрын
Thanks
@krishnaparnami3696
4 жыл бұрын
Question1: yes Question 2: Minimum distance of echo is 17 meter
@aqeefnaufal5404
4 жыл бұрын
Awesome
@ManochaAcademy
4 жыл бұрын
Thanks
@oshiaakarsh3295
3 жыл бұрын
Fantastic Teaching Sir🤩
@சாயிஆராதனா
4 жыл бұрын
Thank you so much.it it very useful to me.
@preetisaini8852
4 жыл бұрын
Awesome...
@RamRam-gs1so
5 жыл бұрын
Sound bahut low thee , muja earphone use krna pada
@ManochaAcademy
5 жыл бұрын
Thanks for your feedback! Yes in new videos I have improved the sound level. Do check out more videos at www.manochaacademy.com
@Ilytarayummy
10 ай бұрын
0:03 My teacher suddenly getting into the point
@riteshking3505
4 жыл бұрын
Thanks a lot sir 🙏🙏
@ManochaAcademy
4 жыл бұрын
Most welcome
@asifahmedasif682
3 жыл бұрын
Thanks sir
@ManochaAcademy
3 жыл бұрын
Welcome
@rajjoshi3106
3 жыл бұрын
Tank u ur guys are making mazing video
@mathangiaditya4289
4 жыл бұрын
1 st question answer : Yes . Angle of incidence is equal to angle of reflection . 2 nd que answer : Because there are a few good absorbers in our room to absorb sound like , curtains . 3 rd que answer : 1 ; distance = speed * time 2d = 340 m/s * 0.3 2d = 102 m d = 102 / 2 = 51 m 2 ; 2d = 340 * 0.5 2d = 170 d = 170/2 d = 85 m So, 51 + 85 = 136 metres is the distance between the two hills .
@mathangiaditya4289
4 жыл бұрын
One more law of light , they all are on the same plane .
@balkimuzam9217
4 жыл бұрын
Is the answers correct
@mathangiaditya4289
3 жыл бұрын
@@ashishkalra9661 No , check or hear the video again !
@ashishkalra9661
3 жыл бұрын
@@mathangiaditya4289 Oh, I got it now. Thankyou!
@mathangiaditya4289
3 жыл бұрын
@@ashishkalra9661 You're Welcome 😊
@powerofmind6253
Жыл бұрын
1.yes! Why not sound also obey the law of reflection because sound also have same angle of incident and reflected sound having same angle and another on same plane. 2.we cannot hear sound in small room due to small distance between source and reflecting surface i.e less than 17m or may be curtains and dull surfaces which absorb sound energy. 3.As we know that. S=v∆t/2 By putting values we get . 343×3/2 =514m. Another we put 343×5/2 =814m Combined we get . 514+814 =1328m Ok sir
@m.vinayagamjeevath2750
28 күн бұрын
Q01. Yes The laws of reflection are : 1.The incident ray , the normal drawn at the point of incidence and the reflected ray all lie on the same plane. 2.The angle of incidence is equal to the angle of reflection. Q02. We cannot hear echoes in a small room because the persistence of sound of human ear is 0.1 seconds . In a small room, since the distance travelled by the sound wave is less it is reflected back and reaches the human ear within 0.1 seconds. Thus , the reflected sound cannot be heard distinctly and it's not an echo. Q03. Distance=speed X time. First echo distance. 2d=340m/s X 0.3s 2d=102 d =51m Second echo distance 2d=340m/s X 0.5 2d=170 d=85m. Total distance=51m + 85m Total distance=136m
@zunairarashed1059
3 жыл бұрын
1. Yes, it does. The laws are stated below 1st law: the incident angle of sound= reflected angle of sound. 2nd law: the incident sound, normal and the reflected sound lie on the same plane 2. Because of insufficient distance echoes can't be heard in small room. We can differenciate between two sound if the time interval between two sounds is 0.1 second. But in a small distance, the sound reflected takes time less than 0.1 sedond. For this we can't differenciate between two sound and can't hear echoes in a small room. 3. Here, for first hill, V= 340 m/s T= 0.3 seconds 2d= vt Or, 2d= 340× 0.3 Or, 2d= 102 Or, d= 102/ 2 Or, d= 51 Here, for second hill, V= 340 m/s T= 0.5 seconds 2d= vt Or, 2d= 340×0.5 Or, 2d= 170 Or, d= 170/ 2 Or, d= 85 Therefore, total= (85+51) = 136 [ Ans ]
@addictionforphysics8509
4 жыл бұрын
Third question answer is 136 because The man standing between two heals and the man fire the bullet and the sound is reflected from both the hills then Distance traveled 2d at 0.3s Distance =speed * time 2d= 340 * 0.3=51 Distance =speed *time 2d=340*0.5=85 Add both distance 85+51=136🎉🎉
@liibaanphysics8120
3 жыл бұрын
Why do you use the speed 340m/s ?
@addictionforphysics8509
3 жыл бұрын
@@liibaanphysics8120 it is speed of sound
@liibaanphysics8120
3 жыл бұрын
Why don't you use 330m/s as speed of sound.
@addictionforphysics8509
3 жыл бұрын
@@liibaanphysics8120 340 m/s is the standard speed of sound. If your weight is 50kg and you are taking it 47kg then your answer will come wrong. So 340
@reenadasif8843
3 жыл бұрын
Best teacher ever
@ManochaAcademy
3 жыл бұрын
Thanks
@sanjaymohanty4057
3 жыл бұрын
Yah
@goldeeshorts7036
2 жыл бұрын
Sir question 3 samag nahi aaraha
@goldeeshorts7036
2 жыл бұрын
@@ManochaAcademy sir q no 3 samage me nahi aaraha hai
@sambraniviishnnuvardanbabuu
Жыл бұрын
@@ManochaAcademy happy birthday manocha academy
@georgemichael2288
2 жыл бұрын
Qn 01. YES it obey... Qn 02. For an echo to occur, it needs at least 17m from an obstacle to listener. Qn 03. The answer is 136 m, (I took velocity of sound in air as 340 m/s)
@Biblogigonogogga
2 жыл бұрын
yee6
@zazislamicchannel7565
4 жыл бұрын
8:49 watch it looks real that sir goes there
@bhaskardebnath324
8 ай бұрын
1. Yes, sound obey the laws of reflection, they are - The incident ray angle is equal to the reflected ray angle The normal, ray of incidence and ray of reflection all lie on the same plane 2. Our ears need some delay before the sound echo can be heard again, that's why in small spaces, as the sound echoes too quickly, it cannot be heard by the ears 3. 1st echo - T = 0.3s D = 2d S = 340m/s 340 = 2×10/3 D = 51m 2nd echo - D = 85m Total distance = 51+85 = 136m
@amitabhabhattacharyya1759
8 ай бұрын
Sir... U explain us all concerned topics of Sound in a very lucid way n lively ...really praiseworthy.. Thanx a lot.. Regards 🙏
@saudshaikh3679
3 жыл бұрын
THANKS FOR YOUR EFFORT
@ManochaAcademy
3 жыл бұрын
Our pleasure!
@Amuvlogs-h8h
2 жыл бұрын
What is sound
@ritikroy4859
2 жыл бұрын
@@artwithshubhojit3816 tera baap bekar phadaha hai nubrd
@artwithshubhojit3816
2 жыл бұрын
@@ritikroy4859 Pls subscribe our channel 😁😎
@harshithgowni1528
5 жыл бұрын
1) Sound does obey the laws of reflection. The laws of reflection for sound is 1. The angle of incidence is equal to the angle of reflection. 2. The incident sound, reflected sound and normal all lie on the same plane. 2) We can't hear echoes in a small room because echoes need a minimum distance of 17m to produce an echo and a room has a much smaller distance than 17 metres. 3) 34m
@ravirk7315
5 жыл бұрын
U r done a good job 3question explanation
@ravirk7315
5 жыл бұрын
Time gap diff is 0.2 sec
@ManochaAcademy
5 жыл бұрын
@Harshi Gowni, Very good!! Q1 and Q2 answers are correct :) Q3, answer should be 136 m. For this question, draw a rough diagram of a man standing between two hills. Let the distance of one hill from the man be 'a' and other hill from man is 'b'. So total distance between to hills is 'a + b'. As discussed in video, for echo since sound travels twice the distance, formula is: 2d = speed x time, where d is the distance. Since it's not given in the sum, you can take speed of sound in air as 340 m/s (or any standard value that you use). Now consider each hill separately: For first time t1 = 0.3 s, we can do 2a = 340 x 0.3. So a = 51 m For 2nd time t2 = 0.5 s, we can do 2b = 340 x 0.5. So b = 85 m So total distance = a + b = 136 m. Let me know if it is clear now!
@harshithgowni1528
5 жыл бұрын
@@ManochaAcademy thanks so much you're videos are so good
@ManochaAcademy
5 жыл бұрын
Thank you :) Do share our videos with your friends and family!
@clashbaba2398
6 жыл бұрын
Sir I'm glad to tell you that I pass my science exam with 78/80 and 79/80 in maths!! Just because of your constant efforts! Thank you sir!
@ManochaAcademy
6 жыл бұрын
Wow! Congratulations!! Excellent marks in Science and Maths :) Which class are you in?
@mayadubey8020
4 жыл бұрын
6th ig 🤣
@AlAmin-ly9nz
13 күн бұрын
😂🎉🎉🎉🎉@@mayadubey8020
@HassanKhan-nl4rj
6 жыл бұрын
Sir plz plz plz plz plz plz plz plz plz plz plz plz plz plz make a video lecture on pH and poh
@ManochaAcademy
6 жыл бұрын
I don't have a video on pH scale. But I have a video on Acids, Bases and Salts: kzitem.info/news/bejne/y32FsamdZpZyY5w
@Nisha-i-z
17 күн бұрын
Tip-watch this video in 1.5x .😂😂😂😂😂😂
@sirpi3940
3 жыл бұрын
Hw answers: 1 i) angle of incidence is equal to the angle of reflection i= r ii) Incident ray, normal and reflected ray all lie in the same plane 2) we cannot hear echoes in a small room because the size of reflector must be large 3) distance between the two hills is 136m Lovely session ever seen 😍
@metuselaonesmo5005
5 жыл бұрын
sir I have loved your teaching style and the vivid examples that you give in your videos
@ManochaAcademy
5 жыл бұрын
Thanks a lot :)
@santoshyadav-fe5nr
3 жыл бұрын
@@ManochaAcademy FFS a good day today I was just thinking about right for me to do it for you to be with you and I have to do it for me and I don't know if you want to go to the store to get a new one for me to do it for you to know if you don't have a good day today and I have to be there in Sir John Salmond is wrong
@yashstarkumar1801
3 жыл бұрын
Ye 1:yes Laws of sound is Echoes and reverberation 2: To listen echones sound the area will be more then we listen .in small room we can't listen because its area will be less .. 3:Distance=speed*time 1st one =2d=340m/s*0.3s Then 2d=102 D=102/2 D=51m 2one =2d=340*0.5s Then 2d=170 D=170/2 D=85 Then1+2= 51+85 =136
@exploringnature1151
3 жыл бұрын
Echoes and reverberation are not the laws of sound and Qno 2 u can directly answer that there is no time gap or very very less
@vedanthgovindan5824
6 ай бұрын
00:05 This video is about the reflection of sound. 01:40 Sound reflection follows similar laws as light. 03:21 Reflection of sound leads to echo and reverberation. 05:01 Understanding sound reflection in large spaces 06:44 Hill absorbs sound energy resulting in softer second hello. 08:24 Reverberation is the persistence of sound caused by overlapping reflections. 10:04 Balance between sound absorption and reverberation in acoustic engineering 11:39 Absorbers reduce sound reflection in the house
@rathorekuldeep5811
7 ай бұрын
1.yes, angle of incidence is equal to angle of reflection and angle I,angle r and normal lie I'm the same plane 2.Because reflecting surface is smaller than the wavelength of sound wave 3.136 m
@chiomaeverista6031
6 ай бұрын
1- YES CAUSE I = r 2- cause the distance is not up 17m nor the time it will won’t be up to 0.1sec 351+85 = 136m
@sarikabalse6724
6 ай бұрын
351 + 85 is 436
@ARJUNFFKING-wn4cw
8 ай бұрын
Sir. I love the way u are teaching i could understand everything ❤🔥❤🔥❤🔥
@ManochaAcademy
8 ай бұрын
Thanks a ton
@HarpreetKaur-mb5sp
3 жыл бұрын
You teaches very well thanks for explaining such an interesting chapter…
@lekshmipriya2467
3 жыл бұрын
Really it is very useful for us Very good teaching😃 Thank you so much 🙏🏻🙏🏻🙏🏻
@ManochaAcademy
3 жыл бұрын
It's my pleasure
@upendrathakuri5843
6 жыл бұрын
Thank you sir for this video... i have a question sir... don't think that what a silly boy ok sir... sir, why sound disappeared suddenly after it produced? what will happend if the sound doesn't disappeared ?can we be able to know our ancistors voices and history? where does the disappered sound stores?
@ManochaAcademy
6 жыл бұрын
Good question :) Sound is a form of energy. When sound is produced, it disturbs the particles of the surrounding material. This is kinetic energy of the particles. And this energy gets dissipated away. It gets converted to a tiny amount of heat energy. This is an example of energy degradation, where it gets converted into a non-useful form such as heat. Hope this helps!
@upendrathakuri5843
6 жыл бұрын
then where will the produced sound goes?
@ManochaAcademy
6 жыл бұрын
As I mentioned it "disappears" in the surrounding medium particles. Sound energy gets converted to heat energy.
@upendrathakuri5843
6 жыл бұрын
sir can we listen that dissapeared sound again?
@ManochaAcademy
6 жыл бұрын
No it's lost :) If you think about the microphone with sound recorder, that's the way to store sound! Sound energy is converted to electrical signal by microphone and it's then stored in digital format by the recorder!
@vedparmar65
4 жыл бұрын
Q-1) Yes, the laws of reflection of sound are as follow Incident rays go ang coming ray is reflected ray. Q-2) We cannot hear echoes in a small room because we hear an echo in a distance of 17 metres or more from the reflecting surface / an area because equal distance in the forward reverse is direction. Q-3) Distance = speed × time Therefore, A) 1st D = 340m/s × 0.3s = 102m B) 2nd D = 340m/s × 0.5s = 170 m Total D = 272m
@josy26
4 жыл бұрын
The total would be the total distance travelled by sound which is not the same as the distance between the two hills, that would be double. So you'd just have to divide it by 2.
@DamilareJoseph234
6 ай бұрын
Yes,1)
@all8nonechannelchannel.78
2 жыл бұрын
This sir was the best teacher, because he explains in English , but the other teachers and KZitem channels think they are the best teachers 🙄, but they can't even explain it in English. I kept so many comments in live chat but they are acting that they are not seen my comments 🙄🙄🙄. So you are my best teacher ❤️
@SylveliaIheshiulo
3 ай бұрын
You're right
@kashinathkarmakar9552
5 жыл бұрын
(Answer of Q1) Yes, sound obeys the laws of reflection. Laws of reflection of sound --- (i) Angle of incidence=angle of reflection. (ii) incident sound, reflected sound and the normal lie on the the same plane. (Answer of Q2) For hearing echoes, the minimum distance between the speaker and the reflecting surface should be 17m. In small rooms, the distance is less than 17m and hence, we cannot hear echoes in small rooms. (Answer of Q3) Distance=speed X time The distance between the man and the 1st hill=(340m/s X 0.3s)/2 =51m The distance between the man and the 2nd hill=(340m/s X .5s)/2 =85m So the total distance between the two hills=(51+85)m=136m.
@roshnib1347
Жыл бұрын
1.yes,
@RamRam-gs1so
5 жыл бұрын
1: yes it does , incident rays = reflected rays 2: beacuse large distance help hear echoes (minimum distance between speaker n reflector should be more than 17 metres ) 3: 1- 51 2- 85( 51 +85=136) Distance between the two hills is 136
@ManochaAcademy
5 жыл бұрын
Q1 Correct. But you have to give the 2 laws of reflection that light has. Q2 Right! Also mention minimum time is 0.1s to hear echo. Q3 Correct answer :)
@ankushgarg7714
3 жыл бұрын
Best teacher ever ☺️😊
@ManochaAcademy
3 жыл бұрын
Thanks
@polly846
3 жыл бұрын
he is 😀
@RohitJ-ej6xx
3 жыл бұрын
Ans 1 Yes, it obeys the laws of reflection. Two laws of reflaction are a. Angle of incidence, reflaction and normal all lie in same plane. b. Angle of reflection is equal to angle of reflection i=r Àns2- we cannot hear the echo sound because of our lower sensitivity of ear and dur to less space. Ans 3- ....
@avrrockstar5923
5 жыл бұрын
sir 3rd answer is distance=speed.time so, 4d=340m/s x 0.8=272m so d=68m
@asmamomin6922
3 жыл бұрын
Best teacher in the universe. ....thanks a lot sir
@ManochaAcademy
3 жыл бұрын
Wow, thanks
@anshikajaiswal185
3 жыл бұрын
1.yes..it obeys the law of reflection...
@valentinoeditz9154
3 жыл бұрын
Pls solve no 3
@BizzBooms
Жыл бұрын
1 - Yes, sound obeys the laws of reflection. Following are the laws: a -
@nnamdimarcel4556
2 жыл бұрын
Please Sir, help me with the solution to the question below: The speed of sound in air is 330ms-1. How far from the centre of a storm is an observer who hears a thunder clap 2s after the lightning flash? (Neglect the time taken by light to travel to the observer)
@marty9019
2 жыл бұрын
The speed of sound in air is 330ms-1. This means that 1 second represents 330m. Now, in the question it says that it takes 2s for the sound to travel from the centre of the storm to the observer this means that the distance at which the oobserver is standing is 330m x 2s. Now here you can remove the units of those values to make it a little less complicated. Acoording to all this your answer I think should be 660m. Hope it helps! Goodluck!
@comfath2.o120
Жыл бұрын
I think its 136 meters distance between the two mountains By the way ❤ from 🇵🇰
@mariajohnyam2096
3 жыл бұрын
You may assist me with these questions; 1. A girl stands 160m away from a high wall and claps her hands at a steady rate so that each clap coincides with the echo of the one before. If she makes 60 claps in one minute, calculate; A) the speed of sound. B) If she moves 40cm closer to the wall, she finds that the clapping rate has to be 80 per minute, calculate the speed of sound.
@vedantsoni7983
3 жыл бұрын
51m and 85m
@DeepakRajput-ri7lw
6 жыл бұрын
sir please make video on plane... in detail
@ManochaAcademy
6 жыл бұрын
You mean video on plane mirrors?
@emmyfunzamize
6 ай бұрын
I am from Nigeria I love ur teaching sir I wish I had a teacher like you here
@himansusahoo586
4 жыл бұрын
Sir my all doubt are clear after this video
@ManochaAcademy
4 жыл бұрын
Glad to hear that.
@premakumarir.9495
4 жыл бұрын
Good explanation sir, thank you sir this helps me in doing online home works ..
@ManochaAcademy
4 жыл бұрын
You are welcome
@divyanshgupta8036
5 жыл бұрын
A2: we cannot hear echoes in a small room because the room is so small and time taken by sound to get reflected and reach our ear is less than 0.1 seconds so our ears are not so sensitive to hear it
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