# Find the wavelength of light radiation with a photon energy of 2 • 10 ^ -19 J?

January 20, 2021 | education

| The photon energy can be calculated using the formula:

E = h * C / λ, where E is the photon energy (E = 2 * 10 ^ -19 J), h is a constant bar (h = 6.63 * 10 ^ -34 J * s), C is the speed of propagation of light in vacuum (C = 300,000 km / s = 3 * 10 ^ 8 m / s), λ is the wavelength of light radiation.

Let us express and calculate the wavelength of light radiation:

λ = h * C / E = (6.63 * 10 ^ -34) * (3 * 10 ^ 8) / (2 * 10 ^ -19) = 9.945 * 10 ^ -7 m = 994.5 nm.

Answer: The wavelength of light is 994.5 nm.

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