5. Nuclear physics
A section of Physics, 0625
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In a famous experiment, a beam consisting of a very large number of α-particles was projected, in a vacuum, at a very thin gold foil. shows the paths of three of the α-particles A, B and C travelling towards the foil. A B C gold foil α-particle A is travelling along a line which does not pass very close to a gold nucleus. α-particle B is travelling along a line which passes close to a gold nucleus. α-particle C is travelling directly towards a gold nucleus. Explain why an α-particle and a gold nucleus repel each other. On , draw lines with arrows to show the continuation of the paths of α-particles A, B and C. State two conclusions, about gold atoms, which resulted from the experiment.
0625_m15_qp_32
THEORY
2015
Paper 3, Variant 2
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