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Sagot :
The calculated energy is 3.97×10⁻²¹J
A single photon has an energy of hv or = (h/2), where h is the Planck constant of 6.626 x 10-34 Joule-sec. If the photon's frequency is known, we may apply the formula E = h f to determine a photon's energy. The equation E = h c can be used to determine a photon's energy if its wavelength is known.
The photon has a 3.97 1021 J energy.
E=hf, with
Planck's constant is h, and the photon's frequency is f.
The second equation is f=c, where c is the speed of light and is the photon's wavelength.
F=c, so we can write
E=hcλ
=6.626×10⁻³⁴J⋅s×2.998×10⁸m⋅s⁻¹/5.00×10⁴×10⁻⁹
=3.97×10⁻²¹J
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