Question

Light of wavelength '$\lambda$' which is less than threshold wavelength is incident on a photosensitive material. If incident wavelength is decreased so that emitted photoelectrons are moving with same velocity then stopping potential will

• A. increase
• B. decrease
• C. be zero
• D. become exactly half

Answer 1

The correct option is A increase

Since by decreasing the wavelength , we are increasing the energy of incident photon , So the energy of photo electrons will increase and hence stopping potential will increase .