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The threshold wavelength for photoelectr...

The threshold wavelength for photoelectric emission from a material is 5200 Å. Photoelectrons will be monochromatic radiation from a

A

50 W infrared lamp

B

1 W infrared lam

C

50 W ultraviolet lamp

D

1 W ultraviolet lamp

Text Solution

Verified by Experts

The correct Answer is:
C, D
The threshold wavelength is `5200A`. For ejectrion of electrons, the wavelength of the light should be less than `5200A` so that frequency increases and hence the energy of incident photon increases. UV light has less wavelength that `5200A`
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