Question

If intensity of radiation incident on a photocell be increased four times keeping frequency constant, then number of photoelectrons and energy of photoelectrons emitted become

• A. Four times, doubled
• B. Doubled, remains unchanged
• C. Remains unchanged, doubled
• D. Four times, remains unchanged

Answer 1

Answer: (D)

Four times, remains unchanged

Number of photoelectrons emitted $\propto$ Intensity of radiation energy of photoelectrons

Energy of photoelectrons emitted $\propto$ Frequency

So, number of photoelectrons emitted becomes four times but energy of photoelectrons remains same.