Home / Physics / Question
MCQ
The kinetic energy of the photoelectron is zero when the frequency of incident light equals:
Physics
A Twice the threshold frequency
B Half the threshold frequency
C The threshold frequency
D Three times the threshold frequency
Explanation

At threshold frequency f₀, KE = hf₀ - φ = 0. The photon energy just equals the work function.

Related MCQs

Mass number equals:
Physics View
The power of a concave lens is always:
Physics View
In radioactive decay, the daughter nucleus has:
Physics View
A wave equation is y = 0.05 sin(10πt - 2πx). Its wavelength is:
Physics View
The torque acting on a body is the rate of change of:
Physics View
The maximum height reached by a projectile launched at 30 m/s at 60° is: (g = 10 m/s²)
Physics View