A photon of wavelength `5000 lambda` strikes a metal surface with work function `2.20 eV` calculate
aTHe energy of the photon in eV
b. The kinetic energy of the emitted photo electron
c. The velocity of the photoelectron

Explanation

To solve the problem step by step, we will calculate the energy of the photon, the kinetic energy of the emitted photoelectron, and finally the velocity of the photoelectron.

### Step 1: Calculate the energy of the photon in eV

The energy of a photon can be calculated using the formula:

\[
E = \frac{hc}{\lambda}
...