Dual Nature Of Radiation And Matter Ques 18
18. 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: 18.(a)
Solution:
- (a) As $E=\frac{12400}{\lambda}$
$ \lambda=\frac{12400}{4}=3100 \AA $
$\therefore \lambda=310 $ $nm$
BETA
