Using Einstein's photoelectric equation show how the cut -off voltage and threshold frequency for a given photosenstive material can be determined with the help of a suitable plot/graph.

Explanation

To determine the cut-off voltage and threshold frequency for a given photosensitive material using Einstein's photoelectric equation, we can follow these steps:

### Step 1: Understand Einstein's Photoelectric Equation
Einstein's photoelectric equation is given by:
\[ E \cdot V_0 = h \nu - \phi_0 \]
Where:
- \( E \) is the charge of an electron (approximately \( 1.6 \times 10^{-19} \) coulombs),
- \( V_0 \) is the stopping potential (cut-off voltage),
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