The threshold wavelength for photoelectric emission from a material is $5200 o A$ . Photoelectrons will be emitted when this material is illuminated with monochromatic radiation from a

50 W infrared lamp

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1 W infrared lamp

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50 W ultraviolet lamp

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1 W ultraviolet lamp

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Solution

The correct options are
A 50 W ultraviolet lamp
C 1 W ultraviolet lamp
Photoelectric effect depends on the frequency(or wavelength) of the light not intensity of the light. So, the light which has less wavelength less than threshold will lead to emission of photoelectrons and the one above that will not.
Ultraviolet wavelength $= 100 A^{o} - 4000 A^{o}$
Infrared wavelength $= 7000 A^{o} - 1 m m$

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