Q 5. In photo electric effect experiment, irradiation of metal with a light of frequency 5.2 x 10¹⁴ s^-1 yields an electron with maximum kinetic energy 1.3 x 10^-19 J. Calculate the threshold frequency

Q 6. The mass of an electron is 9.1 x 10^-31 kg. If its kinetic energy is 3.0 x 10^-25 J, calculate its wavelength.

Q 7. Calculate the wavelength of the radiation emitted producing a line in Lyman series when an electron falls from fourth stationary state in hydrogen spectrum. (R_H = 1.1 x 10⁷ )

Q 8. What are the frequency and the wavelength of a photon emitted during a transition from n = 5 state to n = 2 state in the hydrogen atom?

Q 9. Calculate the wave number for the longest wavelength transition in the Balmer series of atomic hydrogen,

Q 10. a) What is the relationship between wavelength and momentum?
b) Calculate de-Broglie wavelength associated with alpha-particle of energy 7.7 x 10^-13 J and a mass of 6.6 x 10^-24 g.

Q 11. Explain Heisenberg uncertainty principle. On the basis of the above principle, show that electron cannot exist inside the atomic nucleus,