Which statement about nuclear fission is correct?
An example is when hydrogen is converted to helium.
It may happen when a nucleus absorbs a neutron.
The Sun uses fission to generate its energy.
Two nuclei join to make a heavier nucleus.
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The table gives some information about four radioactive isotopes.
Which isotope is the best to use as a medical tracer?
| Half life | Radiation emitted | |
| A | 6 hours | alpha |
| B | 6 hours | gamma |
| C | 6 minutes | gamma |
| D | 6 years | beta |
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Which statement describes nuclear fusion?
A helium nucleus joins with a hydrogen nucleus to form an alpha particle.
Two helium nuclei join to form a hydrogen nucleus.
Two hydrogen nuclei join to form a helium nucleus.
Uranium nuclei split and produce high energy neutrons causing a chain reaction.
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Which statement about nuclear fusion is correct?
Energy is released because mass is converted to energy.
Helium is converted into hydrogen.
It is the main way in which nuclear power generates electricity.
It is the splitting of a heavy nucleus into smaller nuclei.
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