Calculate the velocity of a photo-electron 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, we need to calculate the velocity of the photo-electron and the retarding potential necessary to stop the emission of the electrons. Here’s a step-by-step breakdown of the solution:

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