The work function and kinetic energy of eject electrons are directly relat through the photoelectric effect. Here’s a breakdown of their relationship:
Work function (Φ):
The minimum energy requir to remove an electron from the surface of a solid material.
Measur in electron volts (eV).
Kinetic energy (KE):
The energy possess by a moving electron.
Calculat using the equation: KE = 1/2 * m * v^2 (where m is the mass of the electron and v is its velocity).
Measur in joules (J).
Photoelectric effect:
When light strikes Middle East Mobile Number List a metal surface, it can eject electrons from the surface.
The kinetic energy of the eject electrons depends on the frequency (or wavelength) of the light and the work function of the metal.
The equation relating these three quantities is:
KE = hν – Φ
where:
h is Planck’s Buy Phone Number Digital Library constant (approximately 6.626 × 10^-34 J·s)
ν is the frequency of the light
Φ is the work function of the metal
Key points to remember:
If the frequency of the light TWD Directory is below the threshold frequency (ν₀ = Φ / h), no electrons will be eject, regardless of the intensity of the light.
The kinetic energy of the eject electrons increases linearly with the frequency of the light.
The number of eject electrons increases with the intensity of the light, but the kinetic energy of each electron remains the same.
In summary, the kinetic energy of eject electrons in the photoelectric effect is directly proportional to the frequency of the incident light and inversely proportional to the work function of the material.
Work function chart
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Work Function Chart
A work function chart is a graphical representation of the work functions of various materials. It typically plots the work function (in electron volts, eV) on the y-axis and the material or element on the x-axis.
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Key observations from this chart:
Alkali metals (Cs, K, Na, Li) generally have lower work functions par to other metals.
