Question

In a photoelectric experiment, increasing the intensity of incident light :

• A. increases the number of photons incident and also increases the K.E. of the ejected electrons
• B. increases the frequency of photons incident and increases the K.E. of the ejected electrons.
• C. increases the frequency of photons incident and the K.E. of the ejected electrons remains unchanged
• D. increases the number of photons incident and the K.E. of the ejected electrons remains unchanged

Answer 1

Answer: (D)

$\rightarrow$ Increasing intensity means number of incident photons are increased.
$\rightarrow$ Kinetic energy of ejected electrons depend on the frequency of incident photons, not the intensity.