Question

A photosensitive surface has work function (\phi). If photon of energy (3\phi) falls on this surface, the electron comes out with maximum velocity of (4 \times 10^6 m/s). When photon energy is increased to (7\phi) then maximum velocity will be

• A. (4\sqrt{3} \times 10^6 m/s)
• B. (2\sqrt{3} \times 10^6 m/s)
• C. (4\sqrt{3} \times 10^3 m/s)
• D. (2\sqrt{3} \times 10^3 m/s)

Hint:

Maximum kinetic energy is directly proportional to (Photon energy - Work function).

Answer 1

The Correct Option is A