Much appreciated, thanks for the effort you've been putting into all of our exam results. Will there be a video on oscillations experiments coming out later, or is that something I should go and revise independently?
@zhelyo_physics
2 жыл бұрын
I am just uploading the video now, however these are not complete and you definitely to revise everything independently.
@JO_Piano
2 жыл бұрын
This guy is the real MVP, I want to buy him a Morbius Meal from Binley Mega Chippy.
@edwarddjan8319
Жыл бұрын
Haha!
@w2splashy760
2 жыл бұрын
Thank you so much I would be struggling without you
@hulkking7352
2 жыл бұрын
You are a life saver!!!
@davidwarwick3313
2 жыл бұрын
Just had the exam and you saved my life thank you
@zhelyo_physics
2 жыл бұрын
Glad to hear it went well!
@onlyh2684
2 жыл бұрын
thank you sir for this video sir could you go though a question where there is a radio active source and you have to calculate how much of a substance must decay in order to release a certain amount of energy for unified using moles?
@zhelyo_physics
2 жыл бұрын
I am not sure which question you are talking about, but is it decaying via gamma decay? If so, use E=mc^2 to find the amount needed to decay, m in kg. Find how many moles that is assuming that you know the molar mass. If it's beta or alpha it would be a bit trickier but you would need to find the energy they release with each decay.
@amirkadir7990
2 жыл бұрын
THANK YOU FOR EVERYTHING SIR !!! You are really amazing and helpful 😁
@zhelyo_physics
2 жыл бұрын
Thanks a lot for your kind comments!
@maddyglen5758
2 жыл бұрын
I'm very confused for the polarization of microwaves? Is it not the other way round? Do we just use it this way round for microwaves?
@zhelyo_physics
2 жыл бұрын
it's opposite to the polarisation of a filter. Think of it this way, the grille absorbs, whereas a polarisers has tiny gaps that can let through light that is vibrating this way.
@maddyglen5758
2 жыл бұрын
Okay so I only do it this way for metal grilles? Thank you!
@nanoh4599
2 жыл бұрын
The 🐐🐐 blessing us 🙏
@jadefang1436
Жыл бұрын
Hello, I am slightly confused about the last bit, why would the EM wave not be absorbed when the metal grille is perpendicular to it? Thank you!
@huji-pt1pm
Жыл бұрын
That because an emf (voltage) cannot happen unless a magnetic wave hits the receiver (an EM wave is made up of magnetic and electric waves). The metal grille blocks the magnetic wave if its perpendicular to it, so no magnetic wave reaches the receiver, so there's no reading on the voltmeter.
@twoone6327
2 жыл бұрын
for the last one, when you talk about the EM field being parallel/perpendicular, are you referring to the electric or magnetic component?
@zhelyo_physics
2 жыл бұрын
electric field component
@mroven3726
2 жыл бұрын
Thanks for the video, will there potentially be an oscillations experiment video later?
@Niko_.YouTube
2 жыл бұрын
thank you sir, also do you think this years grade boundaries will be closer to the 2019 or 2021.
@zhelyo_physics
2 жыл бұрын
no idea to be honest. We can only do our best in the exams and then hope for the best. Good luck! : )
@abhiraja1032
2 жыл бұрын
when you plotted 1/f should the units not be just s?
@zhelyo_physics
2 жыл бұрын
Correct! Thanks for spotting!
@abhiraja1032
2 жыл бұрын
@@zhelyo_physics np legend
@shadowdragon1892
4 ай бұрын
Do the tuning forks say the frequency on them?
@zhelyo_physics
4 ай бұрын
typically yes : )
@zhelyo_physics
4 ай бұрын
Also - if we are not you can get measure the time period using a microphone connected to an oscilloscope and then calculate using f=1/T (for osciloscope measure peak to peak distance then multiply by the time base)
@shadowdragon1892
4 ай бұрын
@@zhelyo_physics Ohhh I see, I didn't think of that! That's really interesting. Thank you
@bobjonathon2669
2 жыл бұрын
hey ZPhysics how tall are you
@zhelyo_physics
2 жыл бұрын
170 cm +- 0.59% assuming a measurement resolution of +- 1 cm
@abdubguracha
2 жыл бұрын
@@zhelyo_physics haha
@thevinecompany7733
2 жыл бұрын
Great video! Just a quick question from ocr A paper 3 2020 q 5 d. In the wave experiment the mark scheme doesn't mention stationary waves, I thought as the wave is reflected they would superpose and form a stationary wave, is this true or shall I just talk about the constructive and destructive superposition?
@ElHal04
2 жыл бұрын
it does form a stationary wave, which would then create the fixed nodes and anti nodes. id still mention stationary waves just to be safe
@joshuawalker9782
2 жыл бұрын
for a stationary wave to form the 2 waves that are superposing must have the same amplitude, so that they can completely cancel out and form nodes. because the reflected wave has traveled further it loses amplitude so the 2 waves don't form nodes when they superpose. in a question that is asking about stationary waves we ignore this effect but in this particular question it wants you to say that the resultant amplitude will never quite be 0 because the waves don't completely cancel out.
@kaijss
2 жыл бұрын
that is because a stationary wave does not form. The metal plate is being constantly moved away from the source which means stationary waves only form at regular distances as the plate moves away, and at all other distances there is no stationary wave, rather a messy superposition of the 2 waves. The explanation lies in terms of frequencies having to be integer multiples of the fundamental frequency. That is why the mark scheme only allows reference to path and phase difference and hence does not allow reference to stationary waves because that is incorrect physics. However if the metal plate was FIXED IN PLACE and the microphone was the thing that was moving, then it would be a stationary wave
@sarahmclaren7098
2 жыл бұрын
If the waves are perpendicular to the grill surely that means they won’t be allowed through and so would give a zero voltmeter reading, just confused
@shehz
2 жыл бұрын
Perpendicular is for polarising filters, and Parallel is for Grille
@zhelyo_physics
2 жыл бұрын
Exactly! : ) Excellent question!
@kujojotaro3035
2 жыл бұрын
why is the total number of fringes 6 and not 7?
@zhelyo_physics
2 жыл бұрын
we are not measuring the total number of fringes but the how many fringe seperation distances, x, we can fit. In this case that is 6. Hope this makes sense!
@kujojotaro3035
2 жыл бұрын
@@zhelyo_physics thank you so much
@OutForJupiter
3 ай бұрын
6:22 shouldn't it be (s) as 1/f is T, and F is already(s^-1)
@zhelyo_physics
3 ай бұрын
correct
@archiesutherland6127
2 жыл бұрын
could you not use a micrometer instead of a travelling microscope when measuring the slit seperation?
@zhelyo_physics
2 жыл бұрын
You can't use a micrometer guys. You have to "clamp" your object, e.g. wire to measure it, which is impossible with slit separation. Travelling microscope it is
@Grassmanian
2 жыл бұрын
At 3:15 is that because you would divide the a.u by 6 ?
@swaggy745
2 жыл бұрын
a.u would be the same. the p.u will decrease by a factor of 6
@Sincerely1000
2 жыл бұрын
Hi Sir, why do we get a minimum voltmeter reading when there is 0 intensity of the microwaves?
@zhelyo_physics
2 жыл бұрын
So typically the reading is 0 as most microwaves are blocked but sometimes if it is not fully polarised you may get some reading, hence a minimum
@mohammedhussein2082
2 жыл бұрын
for the sound speed experiment is it just one tube or is it a tube inside a beaker of water? thank you
@zhelyo_physics
2 жыл бұрын
both could be done!
@mohammedhussein2082
2 жыл бұрын
@@zhelyo_physics Thank you so much!
@ayush5212
2 жыл бұрын
would it be ok to talk about plotting a graph of D/x
@zhelyo_physics
2 жыл бұрын
Yep! Just a different gradient
@ChiThanhUong-iq7ss
4 ай бұрын
You saved me from B
@Gotbackk
2 жыл бұрын
What does the x do to the f on the oscilloscope
@zhelyo_physics
2 жыл бұрын
Control the time base, how many milliseconds per cm there are
@Gotbackk
2 жыл бұрын
@@zhelyo_physics so the higher the x the lower f
@zhelyo_physics
2 жыл бұрын
@@Gotbackk nope, frequency remains constant, however the amount of cycles you can visualise increases. I have explained it here: kzitem.info/news/bejne/xYGbmqakcaNmbHY
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