What do we mean by the half-life of a radioactive isotope?
A) it is the amount of time a person can be exposed to radiation without getting sick
B) it is the time for half the number of radioactive nuclei in a sample to become stable nuclei
C) it is the amount of time for half of the nuclei in a sample to become radioactive
D) it is the time for half the number of radioactive nuclei in a sample to decay
Correct Answer:
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Q22: Mineralogical analysis of a rock can tell
Q23: In alpha decay,
A) a proton turns into
Q24: A fossil is found in a layer
Q25: In which type or types of radioactive
Q26: The radioactive isotope 226Ra (atomic number 88)
Q29: A radioactive isotope is
A) an unstable nucleus
Q32: The radioactive isotope 7Be (atomic number 4)
Q35: A fossil is found in a layer
Q40: In beta decay,
A) a neutron turns into
Q41: In which type of radioactive decay does
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