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# The surface of a metal is illuminated with the light of

Question:

The surface of a metal is illuminated with the light of $400 \mathrm{~nm}$. The kinetic energy of the ejected photoelectrons was found to be $1.68 \mathrm{eV}$. The work function of the metal is : (hc $=1240 \mathrm{eV}-\mathrm{nm})$

1. $1.51 \mathrm{eV}$

2. $1.68 \mathrm{eV}$

3. $3.09 \mathrm{eV}$

4. $1.41 \mathrm{eV}$

Correct Option: , 4

Solution: