What is the energy of a photon that has a wavelength of 400nm
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Answer:Energy E=hf
Where, h is Planck's Constant & f is frequency.
As you can see we don't have frequency in our question. But we do know that
f= c/lambda
Where, c is speed of light & lambda us wavelength.
Which is 400nm. In meters it will be 400 × 10^-9
So we can calculate energy, by substituting above values in below equation.
E=hc/lambda.
To convert in (electron volt) i.e ev
Multiply the obtained value of 'E' with 1.6 ×10^-19.
That's it.
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