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QNEET-2016-Ph-1093: NEET 2016 Physics - Class 12 NEET-2016-Ph-1093 Solution: When a metallic surface is illuminated with radiation of…

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

V/4

. The threshold wavelength for the metallic surface is

5\lambda

2\lambda

3\lambda

4\lambda

Multiple Choice Options

A ${5 \over 2}\lambda$ 2 5 _ _
B 3 $\lambda$ _
C 4 $\lambda$ _
D 5 $\lambda$ _

Step-by-Step Verified Solution

According to Einstein's photoelectric effect, eV = h c _ - h c _ 0 .......(1) e V 4 = h c 2 _ - h c _ 0 .......(2) Dividing equation (i) by (ii) by, 4 = 1 _ _ 1 _ 0 1 2 _ _ 1 _ 0 _ _ 0 = 3 _

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