Question

When photons of energy hνare incident on the surface of photosensitive material of work function hν₀, then-

• A. The kinetic energy of all emitted electrons is hν₀
• B. The kinetic energy of all emitted electrons is h (ν –ν₀)
• C. The kinetic energy of all fastest electrons is h (ν ν₀)
• D. The kinetic energy of all emitted electrons is hν

Answer 1

Answer: (C)

The kinetic energy of all fastest electrons is h (ν ν₀)

Answer 2

$\frac { 1 } { 2 }$= hν – hν_o

= h (ν –ν_o)

This is Einstein's equation of photoelectric effect.