Q. 14

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Answer :

Einstein’s photoelectric equation is expressed as:


Where, =maximum kinetic energy of the photoelectron.

=maximum velocity of photoelectron.

m= mass of emitted photoelectron.

= frequency of light radiation.

= work function.

= Planck’s constant.

If is the threshold frequency, then the work function can be written as,

According to the photoelectric equation,

--------- (i)

Let the maximum kinetic energy for wavelength of the incident be,

-------- (ii)


From equation (i) and (ii), we get;

Work function is the energy required to eject photoelectron from the metal.

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