Question

When photons of energy strike the surface of a metal A, the ejected photoelectrons have maximum kinetic energy of eV and de Broglie wavelength . The maximum kinetic energy of photo electrons liberated from another metal B by photons of energy is . If the de Broglie wavelength of these photoelectrons is then

This question has multiple correct options
A

the work function of A is 2.25 eV

B

the work function of B is 4.20 eV

C

eV

D

eV

Hard

Solution

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Correct options are A) , B) and C)

De Broglie wavelength and kinetic energy,  
Thus,   as
Given,
Thus,

From  photo-electric effect:
Work function of A  
and work function of B
Thus, only the option D is wrong. 


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Solution To Question ID 21938
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