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The threshold wave length for photo electric emission from a material is 5,200 Å , Photo electrons will be emitted when this material is illuminated with monochromatic radiation from a

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50 watt sodium vapour lamp

50 watt infrared lamp

1 watt infrared lamp

1 watt ultraviolet lamp

answer is C.

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Detailed Solution

Any wavelength less than 5200 $\overset{0}{A}$ will be able to emit phot electron irrespective of its power. Ultra violet is the only possible wavelength which has required wavelength.

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