First slide

Photo Electric Effect

Question

The threshold wavelength for photoelectric emission from a metal is 5,200A⁰. Photo-electrons will be emitted when this metal is illuminated with monochromatic radiations from
   a) 5.0 watt infrared lamp
   b) 1 watt infrared lamp
   c) 50 watt ultra violet lamp
   d) 1 watt ultraviolet lamp

Easy

A

a,c are correct
B

c,d are correct
C

a,d are correct
D

a,b,c,d are correct

Solution

The threshold wavelength is 5200A⁰. For a photoelectric emission to take place the wavelength of incident light must be less than the threshold value. The wavelength of UV rays is 100−4000A⁰ . so Photoelectrons will be emitted when this material is illuminated with monochromatic radiation from a 50W ultraviolet lamp or 1W ultraviolet lamp.

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