Question

A metallic surface is irradiated by a monochromatic light of frequency and stopping potential is found to be . If the light of frequency irradiates the surface, the stopping potential will be

• A.
• B.
• C.
• D.

Answer 1

Answer: (B)

Answer 2

: Maximum kinetic energy

$K _ { \max } = \frac { 1 } { 2 } m v ^ { 2 } = e v _ { 0 }$

Where $V _ { 0 }$is the stopping potential

According to Einstein’s photoelectric equation

$\frac { h } { e } \left( v _ { 1 } - v _ { 2 } \right) = V _ { 1 } - V _ { 2 }$ or $V _ { 2 } = V _ { 1 } + \frac { h } { e } \left( v _ { 2 } - v _ { 1 } \right)$