Determine the red border of the photoelectric effect for tungsten with a work function of 7.2 * 10 ^ -19 J.
| September 27, 2021 | education
Av = 7.2 * 10 ^ -19 J.
h = 6.6 * 10 ^ -34 J * s.
s = 3 * 10 ^ 8 m / s.
v -?
λ -?
The work function of electrons Av will express the formulas: Av = h * v, where h is Planck’s constant, v is the frequency of photons.
v = Av / h.
v = 7.2 * 10 ^ -19 J / 6.6 * 10 ^ -34 J * s = 10 ^ 15 Hz.
λ = c / v.
λ = 3 * 10 ^ 8 m / s / 10 ^ 15 Hz = 3 * 10 ^ -7 m.
Answer: v = 10 ^ 15 Hz, λ = 3 * 10 ^ -7 m.
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