Question

If a photon has an energy of 8.6 x 10-19 J, what will be its wavelength (in nm)? Show all calculations leading to an answer.

Answer 1

The relations are the following:

e = h.f (or f = e/h), where:
- e is the energy in joules
- h is the Planck constant: 6,626 069 572 9.10-34 joule.second
- f is the frequency in cycles/second
and
- \[\lambda\] = c/f , where:
- \[\lambda\] = is the wavelength in nanometers
- c is the speed of light in vacuum, 299 792 458 m/s
And consequently the wavelength is 230,98 nm.