Dual Nature of Radiation and Matter - Result Question 77
81. The threshold frequency for photoelectric effect on sodium corresponds to a wavelength of $5000 \AA$. Its work function is
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======= ####81. The threshold frequency for photoelectric effect on sodium corresponds to a wavelength of $5000 \AA$. Its work function is
c3eec34ec6b1fad69db54a20ad4b2dca40c2aa54 (a) $4 \times 10^{-19} J$
(b) $1 J$
(c) $2 \times 10^{-19} J$
(d) $3 \times 10^{-19} J$
[1988]
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Answer:
Correct Answer: 81. (a)
Solution:
- (a) $W_0=\frac{h c}{\lambda_0}$
$ =\frac{6.63 \times 10^{-34} \times 3 \times 10^{8}}{5000 \times 10^{-10}}=4 \times 10^{-19} J $
