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A photon of wave length 1240A o strikes ametal surface ejected a photon electron with kinetic energy E E1 if work function associated with metal is 4 e v The value of E is

 A photon of wave length 1240Aostrikes ametal surface ejected a photon electron with kinetic  energy EE1 if work function associated with metal is 4ev
The value of E is
 

Grade:12th pass

1 Answers

Arun
25750 Points
5 years ago
Dear student
 
wavelength = 1240 A
 
Energy associated = hc/ lambda 
energy will come out as 15.97 * 10^-19 J
 
Work function = 4ev = 6.4 * 10^-19 J
 
KE energy = energy associated- work function = 9.57* 10^-19
 

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