Any radiation in the ultra violet region of Hydrogen spectrum is able to eject p

Question

Any radiation in the ultra violet region of Hydrogen spectrum is able to eject photoelectrons from a metal. Then the threshold frequency of the metal for a threshold

λ = \frac{1}{R} = 911 ˙ A

,is nearly

Options:

A . 3.3×1015HZ

B . 2.5×1015HZ

C . 4.6×1014HZ

D . 8.2×1014HZ

Answer: Option A
:
A

c = ν λ

;

ν = \frac{c}{λ} = \frac{3 \times 10^{8}}{911 \times 10^{- 10}}

ν = 3.3 \times 10^{15} H Z

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