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Visible light has wavelengths in the range of 400 nm to 780 nm. Calculate the range of energy of the photons of visible light.

Visible light has wavelengths in the range of 400 nm to 780 nm. Calculate the range of energy of the photons of visible light.

Grade:upto college level

1 Answers

Navjyot Kalra
askIITians Faculty 654 Points
7 years ago
Sol. λ base 1 = 400 nm to λ base 2 = 780 nm E = hv = hc/λ h = 6.63 * 10^-34 j – s, c = 3 * 10^8 m/s, λ base 1 = 400 nm, λ base 2 = 780 nm E base 1 = 6.63 * 10^-34 * 3 * 10^8/400 * 10^-9 = 6.63 *3/4 * 10^-19 = 5 * 10^-19 J. E base 2 = 6.63 *3/47.8 * 10^-19 = 2.55 * 10^-19 J So, the range is 5 * 10^-19 J to 2.25 * 10^-19 J.

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