B: helium nuclei
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When a sample of a radioactive nuclide decays, the count rate falls from 1200 to 150 in three minutes. What is the ha…
Proton number is another name for atomic number. Nucleon number is another name for mass number. What are isotopes?
The centre of the Sun produces large amounts of energy. What is the source of this energy?
The diagram represents part of a household circuit containing an electric kettle. Which row correctly identifies the …
A wire hangs between the poles of a magnet. When there is a current in the wire, in which direction does the wire move?
The diagram shows a simple d.c. motor. Which labelled part is the commutator?