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Question

Physics Question on Dual nature of matter

A 55 watt source emits monochromatic light of wavelength 5000?5000\,?. When placed 0.5m0.5\, m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved to a distance of 1.0m1.0 \,m, the number of photo electrons liberated will:

A

be reduced by a factor of 8

B

be reduced by a factor of 16

C

be reduced by a factor of 2

D

be reduced by a factor of 4

Answer

be reduced by a factor of 4

Explanation

Solution

No. of photoelectrons or intensity 1( distance )2\propto \frac{1}{(\text { distance })^{2}}