A-LevelPhysicsNuclear physicsFeb/Mar 2017Paper 4 Q128 Marks
A stationary nucleus of uranium-238 (²³⁸U) decays to form a nucleus of thorium-234 (²³⁴Th). An α-particle and a gamma-ray photon are emitted. The equation representing the decay is ²³⁸U → ²³⁴Th + ⁴He + γ 92 90 2 The masses of the nuclei are given in Fig. 12.1. nucleus mass/u uranium-238 238.05076 thorium-234 234.04357 helium-4 4.00260 Fig. 12.1
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