A beta-minus particle is:
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Beta-minus decay emits an electron from the nucleus.
Which nuclear radiation has the greatest ionizing power?
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Alpha particles produce dense ionization along their short path.
Nuclear radiation is emitted from:
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Radioactive nuclei are unstable and undergo spontaneous decay.
An alpha particle consists of:
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An alpha particle is the nucleus of a helium-4 atom.
Which of the following is a type of nuclear radiation?
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Alpha particles are emitted during certain radioactive decays.
Gamma rays are:
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Gamma rays are high-energy electromagnetic photons.
The time required for half the radioactive nuclei in a sample to decay is called:
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Half-life is the characteristic time for the number of undecayed nuclei to halve.
Beta radiation can be stopped effectively by:
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Beta particles penetrate farther than alpha particles but can be stopped by thin metal.
The decay constant of a radioactive substance represents its:
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The decay constant gives the probability per unit time that a nucleus decays.
Gamma radiation is commonly reduced using:
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Dense, thick materials are used to attenuate gamma rays.
Alpha radiation is stopped most easily by:
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Alpha particles have very low penetrating power.
Which nuclear radiation has the greatest penetrating power?
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Gamma radiation is much more penetrating than alpha or beta radiation.
The activity of a radioactive sample is proportional to its:
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The SI unit of radioactive activity is:
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One becquerel corresponds to one nuclear decay per second.
The spontaneous disintegration of an unstable nucleus is called:
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Radioactive decay occurs spontaneously in unstable nuclei.
The older unit of radioactive activity is:
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The curie is a traditional unit of radioactivity.
During alpha decay, the mass number of the parent nucleus:
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An alpha particle contains two protons and two neutrons.
During beta-minus decay, the atomic number of the nucleus:
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A neutron changes into a proton while emitting an electron.
During gamma emission, the atomic number and mass number:
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Gamma emission releases excess nuclear energy without changing proton or nucleon count.
A device commonly used to detect ionizing radiation is the:
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A Geiger-Müller counter detects ionizing radiation.
