Question

Light of energy \( E \) falls normally on a metal of work function \( W_0 \). The kinetic energies \( K \) of the photoelectrons are

• A. \( K = 2E/3 \)
• B. \( K = E/3 \)
• C. \( K < 2E/3 \)
• D. \( 0 < K < E/3 \)

Answer 1

The Correct Option is B

The photoelectric effect equation is:
\( K = E - W_0 \) where
\( E \) is the energy of the incident light and 
\( W_0 \) is the work function of the metal. 

The kinetic energy of the photoelectrons is the difference between the energy of the incident photons and the energy required to overcome the work function. 
For typical photoelectric effects, the kinetic energy is a fraction of the photon energy, and it is often observed to be less than \( E \) but still significant.