C: protons and neutrons only
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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?
Tritium is a radioactive isotope of hydrogen with a half-life of 12 years. If a sample starts with 40 million atoms o…
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?
Two leads emerging from a box are connected to a sensitive ammeter. When a bar magnet moves towards the open end of t…