In this video I will explain the Conceptual Questions of Chapter 19 (Atomic Spectra) of class 12th physics subject (in Pashto language) in detail.
1.Why does the spectrum of hydrogen consists of many lines even though a hydrogen atom has only a single electron?
2. Why do solids give rise to continuous spectrum while hot gases give rise to line spectrum?
3. Can the electron in the ground state of hydrogen absorb a photon of energy (a) less than 13.6eV (b) greater than 13.6eV?
4. Why do the spectral lines in the hydrogen atom become closer together farther away from the nucleus?
5. Why it was necessary to quantize angular momentum in Bohr’s model of the atom?
6. Why X-rays have different properties from light even though both originate from orbital transition of electrons in excited atoms?
7. If the potential difference in an x-ray tube is increased, how does this affect the wavelengths of (a) bremsstrahlung x rays and (b) characteristic x-rays?
8. Crystal lattices can be examined with x-rays but not UV. Why?
Conceptual Questions | CH#19 | Atomic Spectra | Class 12 Physics
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