Question

Light of intensity 'x' and wavelength lambda strikes a metal, that emits 'y' electrons per second of maximum energy 'z'. What will happen to 'y' and 'z' if 'x' is halved?

• A. y will be halved
• B. y will be doubled
• C. z remains the same
• D. z will be halved

Answer 1

Answer: (A), (C)

The correct options are
A

y will be halved

C

z remains the same

Intensity is directly proportional to the the number of photons and hence the number of photoelectrons ejected.
Wavelength is inversely proportional to the energy of the electrons that are ejected.
So y is halved and z remains the same.