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Question

Light of wavelength 5000 $$A^{0}$$ is incident on a metallic surface of work function 3.31 eV. Then photoelectric emission is


A
Possible
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B
Not possible
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C
May or may not be possible
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D
Data insufficient
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Solution

The correct option is B Not possible
Energy of photon $$=\ \dfrac{hc}{\lambda }$$
                             $$=\dfrac{20\times10^{-26}}{5000\times10^{-19}}$$
                             $$=\ 4\times 10^{-19}J$$

                             $$=\ 2.5\ eV$$

$$\because $$ Energy of photon < work function

So, emission is not possible. So, the answer is option (B).

Physics
NCERT
Standard XII

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