2 Calculate the threshold frequency of metal from which the photoelectrons are emmited with zero velocity when exposed to radiation of wavelength 6800A.

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Electrons are emitted with zero velocity from a metal surface when it is exposed to radiation of wavelength 6800 Å. Calculate threshold frequency () and work function (W₀) of the metal.

Electrons are emitted with zero velocity from a metal surface, when it is exposed to a radiation of wavelength 6800 Å . Then work function of metal is

Q. The maximum kinetic energy of photoelectrons ejected from a metal, when it is irradiated with radiation of frequency

2 \times 10^{14} s^{- 1}

6.63 \times 10^{- 20} J

. The threshold frequency of the metal is:

Q. The maximum kinetic energy of photoelectrons ejected from a metal, when it is irradiated with radiation of frequency

2 \times 10^{14} s^{- 1}

6.63 \times 10^{- 20} J

. Find the threshold frequency of the metal.

Q. The work function for the caesium atom is

1.9 e V

. Calculate

(a) the threshold wavelength and

(b) the threshold frequency of the radiation. If the caesium element is irradiated with a wavelength of

500 n m

, calculate the kinetic energy and the velocity of the photoelectron.

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