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Question

The threshold wavelength for photoelectric emission from a material is 5200A. Photo-electrons will be emitted when this material is illuminated with monochromatic radiation from a


A

50 watt infrared lamp

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B

1 watt infrared lamp

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C

50 watt ultraviolet lamp

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D

1 watt ultraviolet lamp

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E

Both (c) and (d)

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Solution

The correct option is E

Both (c) and (d)


In this case, for photoelectric emission the wavelength of incident radiations must be less then 5200A . Wavelength of ultraviolet radiations is less then this value (5200A) but wavelength of infrared radiations is higher than this value.


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