calculate the frequency in cycles per second if the wavelength is 25 A and c is 3 ×10^8
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Convert your wavelength into meters.
Divide the speed of light, ~300000000 m / s, by the wavelength in m. This gives you the wave's frequency.
Multiply the frequency by Planck's constant, 6.626 x 10-34. The result is the waves energy in J s.
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