Calculating the wavelength
Calculate the wavelength, in nanometers, of the light emitted by a hydrogen atom when its electron falls from the n=7 to the n=4 principal energy leve.
a. 4.45 * 10^-20nm
b. 2.17 * 10^-6nm
c. 9.17 * 10^-20 nm
d. 1.38 * 10^14 nm
e. 2.17 * 10^3 nm
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