Question

Which of the following statement is true for photoelectric effect?

• A. Photoelectric current is proportional to the frequency of the radiation used for all retarding voltages.
• B. Photoelectric current is proportional to the intensity of the radiation used, for all retarding voltages.
• C. Photoelectric current is proportional to the wavelength of the radiation used, for all retarding voltages.
• D. Photoelectric current is proportional to the energy of the radiation used for all retarding voltages.

Answer 1

The correct option is B Photoelectric current is proportional to the intensity of the radiation used, for all retarding voltages.

As intensity of radiation is increased, the number of incident photons increases which increase the number of ejected photo electrons and thus current increases.