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Question

# A 5 W source emits monochromatic light of wavelength 50000. when placed 0.5 m away. it liiberates photoelectrons from a photosensitive metallic surface, When the source is moved to a distance of 1.0 m, the number of photoelectrons liberated will be reduced by a factor of :

A
4
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B
8
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C
16
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D
2
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Solution

## The correct option is A 4The intensity of light is inversely proportional to the square of the distance1α1r2I1I2=(r1)2(r2)2Given, r1=0.5m,r2=1.0m∴ I2I1=(0.5)2(0)2=14Now, Since no. of photoelectric emitted per second is directly proportional intensity, So no. of electrons would decrease by factor 4.

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