At what wavelength of radiation the photon energy will be equal to 1.5 eV.
| January 25, 2021 | education
1.5 eV = 2.4 * 10 ^ -19 J;
The energy of a photon is related to its wavelength by the Planck relation:
E = h * c / l, where
h – Planck’s constant, 6.63 * 10 ^ -34 J * s;
s – speed of light, 3 * 10 ^ 8 m / s,
l – radiation wavelength, m.
Find the radiation wavelength:
l = h * c / E = (6.63 * 10 ^ -34 * 3 * 10 ^ 8) / (2.4 * 10 ^ -19) = 8.29 * 10 ^ -7 m = 829 nm.
Answer: l = 829 nm.
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