The threshold wavelength of a metal for photoelectric emission is $5000 \overset{0}{A}$ . Photo electric emission will take place from this surface if irradiated by radiation from

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50 watt yellow lamp

5 watt violet lamp

100 watt infrared lamp

100 watt red lamp

answer is D.

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Detailed Solution

For photo emission to occur, the wavelength of the photon (light) must be less than or equal to the threshold wavelength.

Violet lamp has wavelength smaller than $5000 \overset{0}{A}$ and other lamp given here have larger wavelength.

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