Dual Nature of Radiation and Matter - Result Question 57
61. Light of wavelength $5000 \AA$ falls on a sensitive plate with photo-electric work function of 1.9 $eV$. The kinetic energy of the photo-electrons emitted will be
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======= ####61. Light of wavelength $5000 \AA$ falls on a sensitive plate with photo-electric work function of 1.9 $eV$. The kinetic energy of the photo-electrons emitted will be
c3eec34ec6b1fad69db54a20ad4b2dca40c2aa54 (a) $0.58 eV$
(c) $1.24 eV$
(b) $2.48 eV$
(d) $1.16 eV$
[1998]
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Answer:
Correct Answer: 61. (a)
Solution:
- (a) K.E. $=h v-h v_0$
$ \begin{aligned} & =\frac{h c}{\lambda}-h v_0=\frac{12375}{5000}-1.9 \\ & =2.48-1.9=0.58 eV \end{aligned} $
