question_answer

The surface of a metal is illuminated with the light of 400 nm. The kinetic energy of the ejected photoelectrons was found to be 1.68 eV. The work function of the metal is:(\[hc=\] \[1240\text{ }eV.nm\])[AIEEE 2009]

A) \[3.09\text{ }eV\]

B) \[1.41\text{ }eV\]

C) \[1.51\text{ }eV\]

D) \[1.68\text{ }eV.\]

Correct Answer: B

Solution :

[b]