Calculate the threshold frequency of a photon from a photosensitive surface of work function 0.2 eV . Take `h=6.6xx10^(-34)Js.`

Explanation

To calculate the threshold frequency of a photon from a photosensitive surface with a work function of 0.2 eV, we will follow these steps:

### Step-by-Step Solution:

1. **Understand the Work Function**:
The work function (Φ) is the minimum energy required to remove an electron from the surface of a material. It is given as 0.2 eV.

2. **Convert Work Function to Joules**:
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