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#### Question

State two important properties of photon which are used to write Einstein’s photoelectric equation.

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A proton and a deuteron are accelerated through the same accelerating potential. Which one of the two has

less momentum?

Give reasons to justify your answer.

Write Einstein's photoelectric equation and mention which important features in photoelectric effect can be explained with the help of this equation.

The maximum kinetic energy of the photoelectrons gets doubled when the wavelength of light incident on the surface changes from *λ*_{1} to *λ*_{2}. Derive the expressions for the threshold wavelength *λ*_{0} and work function for the metal surface.

The energy of photon of wavelength X is_____ .

[h = Planck’s constant, c = speed of light in vacuum]

(a)hcλ

(b)hλ/c

(c)λ/hc

(d)hc/λ

When radiations of wavelength λ_{1} and λ_{2} are incident on certain photosensitive, such that E_{1} > E_{2} . Then Planck's constant 'h' is ......................... .

(C = Velocity of light).

- `((E_1 - E_2)(lambda_1 - lambda_2))/(C(lambda_1 * lambda_2))`
- `((E_1 - E_2)lambda_1C)/((lambda_1 - lambda_2)lambda_2)`
- `((E_1 - E_2)lambda_1lambda_2)/(C(lambda_2 - lambda_1))`
- `((lambda_1 - lambda_2)C)/((E_1 - E_2)lambda_1 * lambda_2)`

The momentum of a photon of de Broglie wavelength 5000Å is _______.

[Planck’s constant = 6.63 x10^{-34} J.s.]

(A) 1.326 x10^{-28} kg-m/s

(B) 7.54 x10^{-28} kg-m/s

(C) 1.326 x10^{-27} kg-m/s

(D) 7.54 x10^{-27} kg-m/s