Questions
If the wave length of light in an experiment on photo electric effect is doubled keeping the intensity constant
detailed solution
Correct option is D
As the wavelength increases, energy decreases. Hence, electrons may emit or may not emit depending on threshold wavelength. If electrons are emitted they shall have less kinetic energy, hence stopping potential decreases. As the intensity has is same, if electrons emit, the photo electric current do not change.Talk to our academic expert!
Similar Questions
A photo cell is illuminated by a small bright source placed at 1m away. When the same source of light is placed 2m away, which of the following is true about the electrons emitted by the photo cathode?
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