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A plot of the kinetic energy $\left(1 / 2 m v^{2}\right)$ of ejected electrons as a function of the frequency $(v)$ of incident radiation for four alkali metals $\left(M_{1}, M_{2}, M_{3}, M_{4}\right)$ is shown below.
The alkali metals $\mathrm{M}_{1}, \mathrm{M}_{2}, \mathrm{M}_{3}$ and $\mathrm{M}_{4}$ are, respectively -
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The alkali metals $\mathrm{M}_{1}, \mathrm{M}_{2}, \mathrm{M}_{3}$ and $\mathrm{M}_{4}$ are, respectively -
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The correct answer is:
$\mathrm{Rb}, \mathrm{K}, \mathrm{Na}$, and $\mathrm{Li}$
$\stackrel{\mathrm{Rb}, \mathrm{K}, \mathrm{Na}, \mathrm{Li}}{\rightarrow} \mathrm{I} . \mathrm{P} \cdot \downarrow$
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