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2. Calculate the wavelength in nm of a photon with an energy of 2.57 x 10-19 J.

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

Learn more about Energy here-

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