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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a
100 watt infrared lamp
b
1 watt infrared lamp
c
50 watt sodium vapor lamp
d
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