Calculate the velocity of a photoelectron if the work function of the target material is `1.24eV` and the wavelength of incident light is `4.36xx10^(-7)`m. What retarding potential is necessary to stop the emission of the electrons?

Explanation

To solve the problem of calculating the velocity of a photoelectron and the necessary retarding potential to stop the emission of electrons, we can follow these steps:

### Step 1: Calculate the energy of the incident photons
The energy of the incident photons can be calculated using the formula:
\[ E = \frac{hc}{\lambda} \]
where:
...