9-1 Topic 6 Radioactivity 1
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» 9-1 Topic 6 Radioactivity 1
The diagram shows parts of a nuclear power station. Which part of the power station provides thermal (heat) energy from a chain reaction?
Which part of the power station transfers kinetic energy into electrical energy?
One isotope of the element potassium is potassium-40. A nucleus of potassium-40 is represented by. The number of neutrons in a nucleus of ptassium-40 is:
Which of these symbols is correct for the nucleus of a different isotope of potassium?
Use the graph to find the half-life of potassium-40.
2500 million years
1300 million years
3000 million years
650 million years
Some radioactive isotopes emit positrons. Positrons are used to make gamma rays. When a positron annihilates an electron, two gamma rays are produced. Which diagram shows the directions of the two gamma rays produced?
Many different types of radioactive isotope are used for the diagnosis and treatment of medical conditions. Iodine-123 is used as a radioactive tracer to diagnose thyroid problems. This tracer must have a half-life of (complete the sentence):
a few days
a few hours
less than a second
Cobalt-60 is a radioactive substance. A nucleus of cobalt-60 contains 27 protons and 33 neutrons. The number of electrons in a neutral atom of cobalt-60 is
Gamma radiation from cobalt-60 can be used to destroy tumours. The diagram shows how gamma radiation is used to destroy a brain tumour. Gamma radiation is used because
gamma can penetrate further than alpha or beta
gamma is more ionising than alpha or beta
gamma is always safer than alpha or beta
gamma has a shorter half-life than alpha or beta
The unit of activity of a radioactive isotope is the
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