Determine the wavelength of red light, the quantum energy of which is 26 * 10 ^ -20J.

univerkov | February 17, 2021 | education

Initial data: E (energy of a quantum of a wave of red) = 26 * 10 ^ -20 J.

Reference values: h (Planck’s constant) = 6.62 * 10 ^ -34 J * s; C (speed of a light wave) = 3 * 10 ^ 8 m / s.

We determine the wavelength of red light from the formula: E = h * C / λ, whence λ = h * C / E.

Calculation: λ = 6.62 * 10 ^ -34 * 3 * 10 ^ 8 / (26 * 10 ^ -20) = 7.64 * 10 ^ -7 m.

Answer: The wavelength of red light is 7.64 * 10 ^ -7 m.

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