The current in an electron beam in a cathode-ray tube is measured to be 50 µA.How many electrons hit the screen in 7.0 s? (e = 1.6 × 10−¹⁹ C) A)4.4 × 10¹¹ electrons B)3.5 × 10¹³ electrons C)2.2 × 10¹⁵ electrons D)3.1 × 10¹⁸ electrons E)2.7 × 10¹⁷ electrons

Question

Quizplus · Accepted Answer

The number of electrons can be calculated using the formula: Number of electrons = (Current × Time) / Charge of one electron. Substituting the given values: (50 × 10^-6 A × 7 s) / (1.6 × 10^-19 C) = 2.2 × 10^15 electrons.

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