Values of work function (W0) for a few metals are given below The number of metals which will show photoelectric effect when light of wavelength 400nm falls on it is __________Given : h=6.6×10−34J sc=3×108m s−1 e=1.6×10−19C

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Values of work function $(W_{0})$ for a few metals are given below
Question Image
The number of metals which will show photoelectric effect when light of wavelength 400nm falls on it is __________
Given : $h = 6.6 \times 10^{- 34} J s$
$c = 3 \times 10^{8} m s^{- 1} e = 1.6 \times 10^{- 19} C$

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answer is 3.

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Detailed Solution

$ϕ < \frac{hc}{λ} \Rightarrow \frac{hc}{λ} = \frac{6.6 \times 10^{- 34} \times 3 \times 10^{8}}{400 \times 10^{- 9}} J = \frac{6.6 \times 3}{400} \times 10^{- 17} = 4.95 \times 10^{- 19} J In ev = \frac{4.95 \times 10^{- 19}}{1.6 \times 10^{- 19}} = 3.093 ev$
If $ϕ < 3.093 eV$ then photo electron will be ejected
So Ans : 3 (Li, Na & K)