Modern Physics
Photoelectric Threshold Frequency
The minimum frequency of light required to eject electrons from a material. Below this frequency, no photoelectric effect occurs regardless of intensity.
Variables
f_{threshold}Hz
Threshold frequency
\phiJ
Work function
hJ·s
Planck constant
Derivation
From photoelectric equation when kinetic energy equals zero.
Your notes
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Common questions
What is the Photoelectric Threshold Frequency formula?
Photoelectric Threshold Frequency is written fₜₕᵣₑₛₕₒₗd = φ/h. The minimum frequency of light required to eject electrons from a material. Below this frequency, no photoelectric effect occurs regardless of intensity. It belongs to Modern Physics, under Quantum Mechanics.
What are the units in fₜₕᵣₑₛₕₒₗd = φ/h?
In SI units, f_{threshold} is threshold frequency, measured in Hz; \phi is work function, measured in J; h is planck constant, measured in J·s.
How is the Photoelectric Threshold Frequency formula derived?
From photoelectric equation when kinetic energy equals zero. The result is fₜₕᵣₑₛₕₒₗd = φ/h.