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23 Cards in this Set
- Front
- Back
The type of radioactive particle that can be stopped by a sheet of paper is the _____. |
alpha particle |
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The most penetrating type of radiation is the _____. |
gamma ray |
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One type of radioactive device that indicates the intensity of radiation with a clicking sound that increases in frequency as more radiation is present is a _____. |
Geiger counter |
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A helium nucleus with two protons and two neutrons is called a _____. |
alpha particle |
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When strong force is not sufficient to hold unstable nuclei together permanently, _____. |
the nuclei decay |
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An instrument that detects radiation by means of a superheated liquid is a _____. |
bubble chamber |
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Negatively charged particles emitted from a nucleus at a high speed are _____. |
beta particles |
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The process by which nuclei having low masses are united to form nuclei with larger masses is _____. |
nuclear fusion |
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The three types of nuclear radiation in increasing order of penetrating power are _____. |
alpha, beta, gamma |
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The stability of an isotope nucleus depends on the _____. |
neutron-to-proton ratio |
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Radioactive tracers are useful in ____. |
determining medical problems |
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Both a fusion reactioln and a fission reaction _____. |
produce energy |
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Neutrons released in a fission reaction can strike other nuclei and cause _____. |
a chain reaction |
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What would a scientests most likely use carbon-14? |
to calculate the age of a piece of bone |
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Thorium-234 has a half-life of 24 days. If you started with a 100-g sample of thorium-234, how much would remain after 48 days? |
25-g |
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What element is most likely to be produced during nuclear fusion reaction in the Sun? |
helium-4 |
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If a source of radiation is placed near _____ cells, atoms in the cells can be ionized and can die or stop growing. |
cancer |
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When the _____ in not large enough to hold a nucleus together tighly, the nucleus can become radioactive. |
strong force |
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Materials that continue to glow in the dark after they have been exposed to light are said to be _____. |
phosphorescent |
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The ratio of protons to neutrons in stable isotopes of the lighter elements tends to be approximately _____. |
1:1 |
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The most difficult radiation to block out is _____. |
gamma rays |
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A particle released during the fission of uranium-235 is a _____. |
neutron |
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If a neutron begins a nuclear chain reaction, then one product of that reaction must be _____. |
a neutron |