The energy required to stop ejection of electrons from a Cu plate is `0.24 eV` .Calculate the work function Cu when a radiation of wavelength `lambda = 250` nm strikes the plate

Explanation

To solve the problem, we need to calculate the work function of copper (Cu) when radiation of wavelength \( \lambda = 250 \) nm strikes the plate. The energy required to stop the ejection of electrons from the Cu plate is given as \( 0.24 \) eV.

### Step-by-Step Solution:

1. **Convert the Kinetic Energy from eV to Joules**:
The kinetic energy (KE) required to stop the ejection of electrons is given as \( 0.24 \) eV. We need to convert this energy into joules using the conversion factor \( 1 \, \text{eV} = 1.6 \times 10^{-19} \, \text{J} \).

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