First slide

Photo Electric Effect

Question

If the wave length of light in an experiment on photo electric effect is doubled keeping the intensity constant

Moderate

A

The photo electrons may or may not be emitted
B

The stopping potential decreases if electrons are emitted
C

The photo electric current does not change if electrons are emitted
D

All the above

Solution

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.

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