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Critical mass
Critical mass
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Subject
Physics
Level
Key Stage 4
Resource type
Glossary
Teaching type
Other
Partner resource
Critical mass
[Student activity]
Is also part of...
Nuclear fission
[Whiteboard presentation]
Relevant to...
Resources Structure
Key Stage 4
Physics
XVIII. Nuclear physics
103. Nuclear fission
Exam Specifications
Key Stage 4
AQA GCSE Science A (4461) Physics
II. Physics 1b - Radiation and the Universe
2. What are the uses and dangers of emissions from radioactive substances?
to evaluate the possible hazards associated with the use of different types of nuclear radiation
to evaluate measures that can be taken to reduce exposure to nuclear radiations
to evaluate the appropriateness of radioactive sources for particular uses, including as tracers, in terms of the type(s) of radiation emitted and their half-lives.
The basic structure of an atom is a small central nucleus composed of protons and neutrons surrounded by electrons.
The atoms of an element always have the same number of protons, but have a different number of neutrons for each isotope.
Some substances give out radiation from the nuclei of their atoms all the time, whatever is done to them. These substances are said to be radioactive.
Identification of an alpha particle as a helium nucleus, a beta particle as an electron from the nucleus and gamma radiation as electromagnetic radiation.
Properties of the alpha, beta and gamma radiations limited to their relative ionising power, their penetration through materials and their range in air.
Alpha and beta radiations are deflected by both electric and magnetic fields but gamma radiation is not.
The uses of and the dangers associated with each type of nuclear radiation.
The half-life of a radioactive isotope is defined as the time it takes for the number of nuclei of the isotope in a sample to halve or the time it takes for the count rate from a sample containing the isotope to fall to half its initial level.
AQA GCSE Physics (4451)
IV. Physics 1b
15. What are the uses and dangers of emissions from radioactive substances?
The uses of and the dangers associated with each type of nuclear radiation.
V. Physics 2
26. What are nuclear fission and nuclear fusion?
to sketch a labelled diagram to illustrate how a chain reaction may occur.
There are two fissionable substances in common use in nuclear reactors, uranium 235 and plutonium 239.
Nuclear fission is the splitting of an atomic nucleus.
For fission to occur the uranium 235 or plutonium 239 nucleus must first absorb a neutron
The nucleus undergoing fission splits into two smaller nuclei and 2 or 3 neutrons and energy is released.
The neutrons may go on to start a chain reaction.
Nuclear fusion is the joining of two atomic nuclei to form a larger one.
Nuclear fusion is the process by which energy is released in stars.
AQA GCSE Physics (4451)
I. Physics 2
10. What are nuclear fission and nuclear fusion?
Nuclear fission is the splitting of an atomic nucleus.
For fission to occur the uranium 235 or plutonium 239 nucleus must first absorb a neutron
The nucleus undergoing fission splits into two smaller nuclei and 2 or 3 neutrons and energy is released.
The neutrons may go on to start a chain reaction.
Nuclear fusion is the joining of two atomic nuclei to form a larger one
Nuclear fusion is the process by which energy is released in stars.
to sketch a labelled diagram to illustrate how a chain reaction may occur.
There are two fissionable substances in common use in nuclear reactors, uranium 235 and plutonium 239.
Copyright
YDP SA
Keywords
mass
,
reaction
,
chain
,
material
,
nuclear
,
fission
,
critical
,
fissile
,
avalanche
,
nuclear fission
,
fissile material
,
avalanche reaction
,
fission reaction
,
chain reaction
,
critical mass
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Physics – Key Stage 4
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