Find the frequency of light which ejects electrons from a metal surface , fully stopped by a retarding potential of 3.3 V. If photo electric emission begins in metal at a frequency of `8xx10^(14)Hz`, calculate the work function (in eV) for this metal.

Explanation

To solve the problem step by step, we will follow the concepts of the photoelectric effect and use Einstein's photoelectric equation.

### Step 1: Understand the Problem
We need to find the frequency of light that can eject electrons from a metal surface, which is fully stopped by a retarding potential of 3.3 V. We also need to calculate the work function of the metal, given that photoelectric emission begins at a frequency of \(8 \times 10^{14} \, \text{Hz}\).

### Step 2: Use Einstein's Photoelectric Equation
Einstein's photoelectric equation is given by:

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