A-LevelPhysicsForces, density and pressureOct/Nov 2013Paper 1 Q111 Mark
A beam of α-particles collides with a lead sheet. Each α-particle in the beam has a mass of 6.6 × 10⁻²⁷ kg and a speed of 1.5 × 10⁷ ms⁻¹. 5.0 × 10⁴ α-particles per second collide with an area of 1.0 cm² of lead. Almost all of the α-particles are absorbed by the lead so that they have zero speed after collision. What is an estimate of the average pressure exerted on the lead by the α-particles?
A5.0 × 10⁻¹⁵ Pa
B5.0 × 10⁻¹³ Pa
C5.0 × 10⁻¹¹ Pa
D5.0 × 10⁻⁹ Pa
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The correct answer is C. This question tests the candidate's understanding of forces, density and pressure within the Physicssyllabus. The examiner's mark scheme requires...
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