What is the energy of a 426 nm photon emitted from a light source? I came up with 2.822676 x 10 -22, but this is wrong. Answer in units of J.

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The relationship between energy and frequency for light is given by the equation E = hf, where h is Planck's constant and f is the frequency of the photon in m/s.

In this problem you have the wavelength, 426 nm, but the frequency is 1/wavelength.   !/426 nm = 2.347 x 10^6 Hz. Planck's constant is 6.626 x 10^-34 J/s.  Multiplying the two values gives an answer of 1.555 x 10^-27 J of energy.

 

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