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Question

The work function of a substance is 4.0eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately


A
5400A0
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B
4000A0
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C
3100A0
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D
2200A0
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Solution

The correct option is C 3100$$A^{0}$$
$$\phi =\dfrac{hc}{\lambda_m}$$

$$\lambda_m=\dfrac{hc}{\phi }$$

$$=\dfrac{1240}{4}    (hc=1240 ev-nm)$$

$$=310nm$$
$$=3100A.$$
So, the answer is (C).

Physics

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