Question

When photons of wavelength 600 nm are shone onto a particular metal surface the highest energy electrons emitted have an energy of 0.4 eV. What will be the maximum energy of electrons emitted when photons of wavelength 400 nm are shone onto the same metal surface?

Answer 1

The energy of 600 nm photon is

Converting to eV

The emitted electron has an energy of 0.4 eV. So, the work function of the given metal surface is

Now the energy of 400 nm photons is

Converting to eV

Now the maximum energy of the emitted electron is

So, the answer to this question is 1.436 eV.