The Current in an Electron Beam in a Cathode-Ray Tube

Multiple Choice

The current in an electron beam in a cathode-ray tube is measured to be 50 µA.How many electrons hit the screen in 4.0 s? (e = 1.6 × 10−¹⁹ C)

A) 2.5 × 10¹¹ electrons
B) 2 × 10¹³ electrons
C) 1.2 × 10¹⁵ electrons
D) 3.1× 10¹⁸ electrons
E) 1.6 × 10¹⁷ electrons