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Physics · 2022 · 3 marks
CBSE 2022 · Region 3 · Set 2 · Q4
(a) Calculate the frequency of a photon of energy 6.5 × 10^-19 J. (b) Can this photon cause emission of an electron from the surface of Cs of work…
(a)
Calculate the frequency of a photon of energy $\displaystyle 6.5 \times 10^{-19} \mathrm{~J}$.
(b)
Can this photon cause emission of an electron from the surface of Cs of work function $\displaystyle 2.14$ eV ? If yes, what will be maximum kinetic energy of the photoelectron ?
Marking-scheme solution
$\displaystyle E=h v$
$$\begin{aligned}
v=\frac{E}{h} & =\frac{6.5 \times 10^{-19}}{6.63 \times 10^{-34}} \\
& =9.8 \times 10^{14} \mathrm{~Hz}
\end{aligned}
$$
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