Question

Two identical photocathode receive light of frequency ν₁ and ν₂. If the velocities of the photoelectrons (of mass m) coming out are v₁ and v₂, respectively, then-

• A. v₁ – v₂ =
• B. =
• C. v₁ + v₂ =
• D. =

Answer 1

Answer: (B)

=

Answer 2

hν₁ = hν₀ + $\frac { 1 } { 2 } \mathrm { mv } _ { 1 } ^ { 2 }$

hν₂ = hν₀ +

∴ h(ν₁ – ν₂) = $\frac { 1 } { 2 }$ m ()