If the line spectrum of lithium has a red line at 670.8 nm. How much energy does a a photon with this wavelength have?

1 answer:

Colt1911 [192]3 years ago

5 0

We already know the formula for finding the energy of a photon with this wavelength as:
E = ħc / λ
The information's that we already know are:
h = Plancks constant
= 6.626x10^-34 Js
c = light speed
= 2.999x10^8 m/s
λ = Wavelength of the light as given in the question
 = 670.8x10^-9 m
E = amount of energy
Then
E = (6.626x10^-34) * (2.999x10^8)/ (670.8x10^-9)
= 2.962x10^-19 J

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