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Questions  >>  JEEMAIN and NEET  >>  NEET PAST PAPERS  >>  2016
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Q)

When a metallic surface is illuminated with radiation of wavelength $\lambda$, the stopping potential is $V$. If the same surface is illuminated with radiation of wavelength $2 \lambda$, the stopping potential is $\frac{V}{4}$. The threshold wavelength for the metallic surface is :


( A ) $ 5 \lambda$
( B ) $ 3 \lambda$
( C ) $ \frac{5}{2} \lambda$
( D ) $ 4 \lambda$

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