A-LevelPhysicsNuclear physics9702/23 · Oct/Nov 2017 · Q74 Marks

(a) A nucleus X decays by emitting a β⁺ particle to form a new nucleus, ²³₁₁Na. State the number of nucleons and the number of neutrons in nucleus X. (b) State one similarity and one difference between a β⁺ particle and a β⁻ particle.

(a)State the number of nucleons and the number of neutrons in nucleus X.[2]
(b)State one similarity and one difference between a β⁺ particle and a β⁻ particle.[2]

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2017). The mark or mark type is shown in brackets.

7(a) nucleons = 23 B1 neutrons = 11 B1
7(b) similarity: B1 same (rest) mass or equal (magnitude of) charge difference: B1 opposite (sign of) charge or one is matter and one is antimatter or one is an electron and one is an antielectron

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Topic: Nuclear physics, A-Level Physics (syllabus 9702). Structured question, 4 marks.
Source: A-Level Physics, Oct/Nov 2017 Paper 2 Variant 3, question 7.

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