
radioactivity and half-life
Flashcard
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Biology, Chemistry, Physics
•
7th - 11th Grade
•
Practice Problem
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Medium
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14 questions
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1.
FLASHCARD QUESTION
Front
What is radioactivity?
Back
Radioactivity is the process by which unstable atomic nuclei lose energy by emitting radiation.
2.
FLASHCARD QUESTION
Front
What is half-life?
Back
Half-life is the time required for half of the radioactive atoms in a sample to decay.
3.
FLASHCARD QUESTION
Front
If 10 mg of iodine-131 is given to a patient, how much is left after 8 days? (Half-life = 8 days)
Back
5.0 mg
4.
FLASHCARD QUESTION
Front
If the half-life of a radioactive element is 100 years, how long would it take for the radioactivity to reduce by one half?
Back
100 years
5.
FLASHCARD QUESTION
Front
After the third half-life, how much of the sample is left?
Back
1/8 of the original sample.
6.
FLASHCARD QUESTION
Front
The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 2.4 minutes?
Back
50.0 g
7.
FLASHCARD QUESTION
Front
What is radioactive decay?
Back
Radioactive decay is the process by which unstable atoms emit radiation until they become stable.
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