Q.

The threshold wave length of a metal for photoelectric emission is 5000 A°.  Photo electric emission will take place from this surface if irradiated by radiation from

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a

100 watt infrared lamp

b

100 watt red lamp

c

50 watt yellow lamp

d

5 watt violet lamp

answer is D.

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Detailed Solution

Frequency defines whether photoelectric emission is possible or not instead of power. Hence, since violet has highest frequency it will allow the photoelectronic emission

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The threshold wave length of a metal for photoelectric emission is 5000 A°.  Photo electric emission will take place from this surface if irradiated by radiation from