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Threshold wavelength for photoelectric e...

Threshold wavelength for photoelectric emission from a metal surface is 5200 A. Photoelectrons will be emitted when this surface is illuminated with monochromatic radiation from

A

50 watt infrared lamp

B

50 watt ultraviolet lamp

C

1 watt infrared lamp

D

10 watt infrared lamp

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The correct Answer is:
B
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KCET PREVIOUS YEAR PAPERS-MODEL TEST PAPER 4-PHYSICS
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