Question

When a metal surface has been electrically charged by rubbing it with a cloth, electrons are poised to leave it. Is the speed of an electron ejected from a gold atom the same as the speed of an electron ejected from a potassium atom?

	Au	K
threshold frequency	2.11 x 1015 s-1.	8.62 x 1014 s-1.
work function	8.16 x 10-19 J.	3.68 x 10-19 J.

1. Calculate the kinetic energy of an ejected electron for both of these metals. Which metal produced a more energetic electron?

Answer 1