Author Question: Measurements show that it takes 0.30 mJ of work to move 5.0-C of charge from one plate to another of ... (Read 13 times)

mpobi80 · **on:** Jul 29, 2018

Measurements show that it takes 0.30 mJ of work to move 5.0-C of charge from one plate to another of a certain air-filled capacitor while the potential difference between these plates is kept constant.

What is the potential difference between the plates of this capacitor? A) 60 V
B) 81 V
C) 55 V
D) 23 V
E) 0 V

Question 2

A metal surface has a work function of 2.50 eV. What is the longest wavelength of light that will eject electrons from the surface of this metal?

(1 eV = 1.60 10-19 J, c = 3.00 108 m/s, h = 6.626 10-34 J s)