A monochromatic light source of intensity 5 mW emits `(8xx10^15)` photons per second . This light ejects photoelectrons from a metal surface. The stopping potential for this setup is 2.0 V. Calculate the work function of the metal.

Explanation

To solve the problem step by step, we will follow these calculations:

### Step 1: Calculate the Energy of a Single Photon
The energy of a photon can be calculated using the formula:

\[ E = \frac{P}{n} \]
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