JEE MAIN - Physics (2023 - 31st January Evening Shift - No. 4)
If the two metals $\mathrm{A}$ and $\mathrm{B}$ are exposed to radiation of wavelength $350 \mathrm{~nm}$. The work functions of metals $\mathrm{A}$ and $\mathrm{B}$ are $4.8 \mathrm{eV}$ and $2.2 \mathrm{eV}$. Then choose the correct option.
Metal B will not emit photo-electrons
Both metals $\mathrm{A}$ and $\mathrm{B}$ will not emit photo-electrons
Metal A will not emit photo-electrons
Both metals A and B will emit photo-electrons
Explanation
$$
\phi=\frac{h c}{\lambda}=\frac{1240}{350} \mathrm{eV}=3.54 \mathrm{eV}
$$
$\therefore$ Only metal B will emit photoelectron.
$\therefore$ Only metal B will emit photoelectron.
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