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4 marksAtomic Mass

CAPE Physics Unit 2 · 2015 · Paper 2 · Question 6(c)(i)

A nuclear fusion reaction combines deuterium (^2_1\text{H}) and tritium (^3_1\text{H}): ^2_1\text{H} + ^3_1\text{H} \rightarrow ^4_2\text{He} + ^1_0\text{n} + \Delta E. Masses: ^2_1\text{H} = 2.014102\text{ u}, ^4_2\text{He} = 4.002602\text{ u}, ^3_1\text{T} = 3.016049\text{ u}, ^1_0\text{n} = 1.008665\text{ u}.

Calculate the mass defect in kilograms.

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Other parts of this question

  1. 6(a)State TWO conclusions regarding the nature of atomic structure that were deduced from the results of the Geiger–Marsden experiment.[2 marks]
  2. 6(b)(i)Distinguish between the terms 'mass defect' and 'binding energy'.[3 marks]
  3. 6(b)(ii)Sketch a graph to show the relationship between binding energy per nucleon and nucleon number.[3 marks]
  4. 6(c)(ii)Hence, calculate the energy in MeV which would be released in this reaction.[3 marks]

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