Question

Answer please..............​

Answer 1

Explanation:

Photons of energies successively =1eV and 2eV.

.

ii incident on a mettalic surface =0.5eV

. so the ratio will be =Energies in both cases /the incident on mettalic surface of work function

.

1.eV*2eV =0.5.

.

2eV=0.5.

.

eV=0.5/2

=1:4 is your answer Siso

Answer 2

Explanation:

Here is your answer

I hope it will help you.