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

question 70

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 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

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