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Radiation & HalfLife
cava chem 303 s2d79 8.02 Radiation and Half-Life
Question | Answer |
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Radioactivity is the decay of an unstable atomic nucleus, followed by the release of [...]. | Radioactivity is the decay of an unstable atomic nucleus, followed by the release of radiation. |
Quarks attract one another via the [...] nuclear force. | Quarks attract one another via the strong nuclear force. |
Neutrons help [-ize] the nucleus. | Neutrons help stabilize the nucleus. |
Unstable nuclei [...] to become stable. | Unstable nuclei decay to become stable. |
alpha emission – emits a [...] nucleus (2 protons, 2 neutrons aka: alpha particle), often released from a large atom | alpha emission – emits a helium nucleus (2 protons, 2 neutrons aka: alpha particle), often released from a large atom |
beta emission – emits a high-speed [...] or [...] ([...]) from the nucleus (not from the orbitals) | beta emission – emits a high-speed electron or positron (antielectron) from the nucleus (not from the orbitals) |
gamma emission - emits an [...] [...] | gamma emission - emits an electromagnetic wave |
[...] particles can be stopped by paper or skin | alpha particles can be stopped by paper or skin |
[...] particles can be stopped by aluminum foil or Plexiglas | beta particles can be stopped by aluminum foil or Plexiglas |
[...] emissions can be stopped by concrete or lead | gamma emissions can be stopped by concrete or lead |
The half-life (t1/2) of a radioisotope is the amount of time required for [...] of the radioactive nuclei of the parent substance to decay into the daughter substance(s). | The half-life (t1/2) of a radioisotope is the amount of time required for one-half of the radioactive nuclei of the parent substance to decay into the daughter substance(s). |
Half Life: fraction remaining (FR) = [...] (n = number of half-lives) | Half Life: fraction remaining (FR) = 0.5^n (n = number of half-lives) |