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

---

Definitions:

Concrete

A composite building material composed of fine and coarse aggregates bonded together with a fluid cement that hardens over time, used extensively in construction.

Heat Produced

The amount of energy released or absorbed as heat during a chemical or physical transformation.

Aluminum

A silvery-white, soft, nonmagnetic, ductile metal in the boron group, noted for its lightweight and resistance to corrosion.

Silica Glass

A type of glass made primarily of silicon dioxide (SiO2), known for its transparency and chemical stability.