Physics (AS & A Level) · Feb / March 2024 · Paper 12 · Question 36
9702Electric current
A radioactive source produces a beam of α-particles in a vacuum. The average current caused by the α-particles in the beam is 1.5 × 10⁻⁹ A. The beam is incident on a metal target. What is the average number of α-particles hitting the metal target in a time of 3.0 s?
- A4.7 × 10⁹
- B9.4 × 10⁹
- C1.4 × 10¹⁰
- D2.8 × 10¹⁰
As printed in the paper
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Correct answer: C. 1.4 × 10¹⁰
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