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If the two metals \mathrm{A} and \mathrm{B}  are exposed to radiation of wavelength 350 \mathrm{~nm}. The work functions of metals A and B are 4.8 \mathrm{eV}and 2.2 \mathrm{eV}. Then choose the correct option.

Option: 1

Both metals A and B will emit photo-electrons


Option: 2

Metal A will not emit photo-electrons


Option: 3

Metal B will not emit photo-electrons


Option: 4

Both metals A and B will not emit photo-electrons


Answers (1)

best_answer

\mathrm{E}=\frac{\mathrm{hc}}{\lambda}=\frac{1240}{350}=3.54 \mathrm{eV}

If  \mathrm{E>\phi}, photo electrons will emit.
A will not emit and B will emit.

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chirag

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