1 markIn the Sun, nuclear fusion occurs mainly in the core.
Which of the following is a reason for this?
Helium nuclei surround the core.
Most of the Sun’s hydrogen is in the core.
The core contains most of the mass of the Sun.
The temperature is greatest in the core.
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1 markThe graph shows how the binding energy per nucleon depends upon nucleon number for a range of naturally occurring nuclides.
Which of the following can be deduced from the graph?
readily undergoes fission.
Fission releases less energy than fusion.
High mass nuclei cannot undergo fusion.
Low mass nuclei release energy during fusion.
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1 markThe graph shows how the binding energy (B.E.) per nucleon varies with nucleon number A for low mass nuclei.
Which of the following is the energy required to split a He‐4 nucleus into 2 protons and 2 neutrons?
2.6 Me V
7.1 Me V
14.2 Me V
28.4 Me V
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