The work function of a photosensitive element is 2eV. Calculate the velocity of a photoelectron when the element is exposed to a light of wavelength `4xx10^(3)` A.

Explanation

To solve the problem, we will follow these steps:

### Step 1: Understand the relationship between energy and work function
The energy of the incoming photon must overcome the work function of the material to release a photoelectron. The excess energy will be converted into kinetic energy of the photoelectron.

### Step 2: Calculate the energy of the incoming photon
The energy of a photon can be calculated using the formula:
\[ E = \frac{hc}{\lambda} \]
...