"To emit a free electron from a metal surface a minimum amount of energy must be supplied" It is called………………….

"To emit a free electron from a metal surface a minimum amount of energy must be supplied" Give three method to supply energy to a free electron

"To emit a free electron from a metal surface a minimum amount of energy must be supplied" For metal A (tungsten) - work function is 4.52 eV for metal B (thoriated tungsten) it is 2.6 ev, for metallic (oxide coated tungsten) it is 1 eV Which will you prefer as a good electron emitter and why?

To emit a free electron from a metal surface a minimum amount of energy must be supplied.When light of frequency 7.21 * 10^14 Hz is incident on a metal surface, the maximum speed of the ejected electrons is 6 x 10^5 m/s . Calculate the threshold frequency for the metal.

Einstein got Nobel Prize in 1921 for his explanation of photoelectric effect. In order to start photoelectric emission, the mini mum energy acquired by free electron in the metal is called as…………………..