Published by:
CGP EDU Academic Team
Published on: August 13, 2026
The threshold wavelength for photoelectric emission from a material is 5500A. Photoelectrons will be emitted, when this material is illuminated with monochromatic radiation from a
A
infra -red lamp B and C only
B
infra-red lamp A and D only
C
ultra - violet lamp C only
D
ultra-violet lamp Choose the correct answer from the options given below: C and D Only
Text Solution
Verified by ExpertsThe correct answer is:
D
P.E.E will occur if wavelength of incidence wave is less then threshold wavelength. So u. v. rays will be useful for emission.
So both U.V. rays lamps can be used.
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