Dual Nature of Radiation and Matter - Result Question 64
68. In photoelectric effect the work function of a metal is $3.5 eV$. The emitted electrons can be stopped by applying a potential of $-1.2 V$. Then
[1994]
(a) the energy of the incident photon is $4.7 eV$
(b) the energy of the incident photon is $2.3 eV$
(c) if higher frequency photon be used, the photoelectric current will rise
(d) when the energy of photon is $3.5 eV$, the photoelectric current will be maximum
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Solution:
- (a) $h v=W_0+E_k=3.5+1.2=4.7 eV$
