NEET2018Physics-Dual Nature of Radiation and Matter
NEET 2018 Physics Photoelectric Effect MCQ Question
Type: MCQ-conceptual-Medium-Class 12
When the light of frequency 2ν₀ (where ν₀ is threshold frequency), is incident on a metal plate, then the maximum velocity of electrons emitted is v₁. When the frequency of the incident radiation is increased to 5ν₀, the maximum velocity of electrons emitted from the same plate is v₂. The ratio of v₁ to v₂ is
A
1 : 2
B
1 : 4
C
4 : 1
D
2 : 1
Correct Answer
Option A
Detailed Explanation
Using the photoelectric equation, the kinetic energy of emitted electrons is proportional to the frequency of the incident light minus the threshold frequency. The velocity is proportional to the square root of kinetic energy.
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