RE-NEET2024Physics-Photoelectric Effect
RE-NEET 2024 Physics Einstein's Photoelectric Equation MCQ Question
Type: MCQ-numerical-Medium-Class 12
If ϕ is the work function of photosensitive material in eV and light of wavelength of numerical value λ = metre, is incident on it with energy above its threshold value at an instant then the maximum kinetic energy of the photo-electron ejected by it at that instant (Take h-Planck’s constant, c-velocity of light in free space) is (in SI units):
A
e + 2ϕ
B
2e − ϕ
C
e − ϕ
D
e + ϕ
Correct Answer
Option C
Detailed Explanation
The maximum kinetic energy of the photo-electron is given by the equation K.E. = eV − ϕ, where eV is the energy of the incident photon and ϕ is the work function.
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