A-LevelPhysicsElectric fieldsMay/June 2017Paper 4 Q57 Marks
An α-particle is travelling in a vacuum towards the centre of a gold nucleus, as illustrated in Fig. 5.1. [Figure 5.1] The gold nucleus has charge 79e. The gold nucleus and the α-particle may be assumed to behave as point charges. At a large distance from the gold nucleus, the α-particle has energy 7.7 × 10⁻¹³ J.
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