What is the frequency of a photon with a wavelength of 2.85* 10^2 nm? (The speed of light in a vacuum is 2.998 *10^8 m/s. Planck's constant is 6.626 *10^-34 J*s.)
Answer:
Planck's constant is irrelevant. The frequency times the wavelength equals the speed of light, so a simple division gives the answer. Verify that it is 1.05E15 hertz.
frequency = c / wavelenght
it is not a simple divition.
1 nm = 1 x 10^-9 m
2.85 x 10^2 / 1 x 10^-9 = 2.85 x 10^11
frequency = 2.988 x 10^8 / 2.85 x 10^11 = 0.00105 s^-1
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