The threshold wavelength for photo electric emission from a material is 5000 A∘. Photo electrons will be emitted when the material is illuminated with monochromatic radiation from

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100 watt infrared lamp

1 watt infrared lamp

50 watt sodium vapor lamp

50 watt ultra violet lamp

answer is D.

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Detailed Solution

The lamp which will produce light of wavelength less than 5000 A∘ is used uv lamp is used

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