Dual Nature of Radiation and Matter - Result Question 77
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81. The threshold frequency for photoelectric effect on sodium corresponds to a wavelength of $5000 \AA$. Its work function is
======= ####81. The threshold frequency for photoelectric effect on sodium corresponds to a wavelength of $5000 \AA$. Its work function is
3e0f7ab6f6a50373c3f2dbda6ca2533482a77bed:content/english/neet-pyq-chapterwise/physics/dual-nature-of-radiation-and-matter/dual-nature-of-radiation-and-matter—result-question-77.md (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 $
