C: white dwarf
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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 gas is enclosed in a container of fixed volume. It gains heat energy from an external source. What happens to the m…
Four containers are filled with equal volumes of water at the same temperature. Containers A and B are shaded by a tr…
A rod of metal is heated at one end. Which statement best describes the conduction of heat through the metal?