Hi -

I've struggled hard but have reached my own answer to the question below but would be grateful if you could offer your own opinion please ?

To eject an electron from the surface of lithium requires a minimum energy of 4.6 10^-19 J. Would shining a light of a frequency 5 10¹⁵ Hz be sufficient to cause electrons to be emitted? You must justify your answer.

Use Planck's constant in your answer.