Measurements show that it takes 0.30 mJ of work to move 5.0-C of ...

[mpobi80]

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)

[amcvicar]

Answer to Question 1

A

Answer to Question 2

497 nm

[mpobi80]

TYSM

[aliotak]

Thanks for the timely response, appreciate it