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Physics · 2016
JEE Main 2016 · 2016-04-03 Offline · Q21
Radiation of wavelength λ, is incident on a photocell. The fastest emitted electron has speed v. If the wavelength is changed to (3 λ)/4, the speed…
Radiation of wavelength $\displaystyle \lambda$, is incident on a photocell. The fastest emitted electron has speed $\displaystyle v$. If the wavelength is changed to $\displaystyle \frac{3 \lambda}{4}$, the speed of the fastest emitted electron will be :
Official answer
(1)
$\displaystyle >v\left(\frac{4}{3}\right)^{\frac{1}{2}}$
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