Dual Nature of Radiation and Matter - Result Question 21
23. The work function of a photosensitive material is $4.0 eV$. The longest wavelength of light that can cause photon emission from the substance is (approximately)
[NEET Odisha 2019]
(a) $310 nm$
(b) $3100 nm$
(c) $966 nm$
(d) $31 nm$
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Answer:
Correct Answer: 23. (a)
Solution:
(a) As $E=\frac{12400}{\lambda}$
$ \lambda=\frac{12400}{4}=3100 \AA $
$\therefore \lambda=310 nm$
