If an electron emits 3 eV of energy, what is the corresponding wavelength of the emitted photon?

The wavelength of the emitted photon is 413.6 nm

Explanation:

Given;

energy of the emitted photon, E = 3 eV = 3 x 1.602 x 10⁻¹⁹ J

speed of light, c  = 3 x 10⁸ m/s

The energy of the emitted photon is given by;

E = hf

where;

h is Planck's constant = 6.626 x 10⁻³⁴ J/s

f is the frequency of the light = c / λ

λ is the wavelength

Therefore, the wavelength of the emitted photon is 413.6 nm