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For photosensitive surface threshold wav...

For photosensitive surface threshold wavelength is 5200Å .When monochromatic radiation of ……is incident on this surface,photoelectron will be emitted.

A

Infrared bulb of power 1 W

B

infrared bulb of 50 W power

C

Ultraviolet bulb of 1 W power

D

ultraviolet bulb of 50 W power and 1 W power.

Text Solution

Verified by Experts

The correct Answer is:
D
For photo-electric effect `lambdalelambda_(0)`.Here `lambda_(0)=520Å`
Which lies in uyltraviolet region .It will not depend on power so for any power but wavelength `le` 5200 Å photo-electric emission will take place.
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