Calculate the valocity 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 potentia is necessary to stop the emission of the electrons?

Explanation

To solve the problem step by step, we will follow the principles of the photoelectric effect and use the relevant equations.

### 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:
- \( h = 6.626 \times 10^{-34} \, \text{Js} \) (Planck's constant)
- \( c = 3 \times 10^8 \, \text{m/s} \) (speed of light)
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