Determine the wavelength of light that illuminates the metal surface if the photoelectrons have a kinetic energy
| September 27, 2021 | education
Determine the wavelength of light that illuminates the metal surface if the photoelectrons have a kinetic energy of 4.5 * 10 ^ -19 J, and the work function is 3.3 * 10 ^ -19 J.
Ek = 4.5 * 10 ^ -19 J.
Av = 3.3 * 10 ^ -19 J.
h = 6.6 * 10 ^ -34 J * s.
s = 3 * 10 ^ 8 m / s.
λ -?
h * s / λ = Av + Ek.
λ = h * c / (Av + Ek).
λ = 6.6 * 10 ^ -34 J * 3 * 10 ^ 8 m / s / (3.3 * 10 ^ -19 J + 4.5 * 10 ^ -19 J) = 2.54 * 10 ^ – 7 m.
Answer: λ = 2.54 * 10 ^ -7 m.
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