What is Half-Life?
Half-Life

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Chemistry
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9th - 12th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
Half-Life is the time required for half of the radioactive atoms in a sample to decay into a different substance.
2.
FLASHCARD QUESTION
Front
What is alpha decay?
Back
Alpha decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle, consisting of 2 protons and 2 neutrons, resulting in a new element.
3.
FLASHCARD QUESTION
Front
What is beta decay?
Back
Beta decay is a type of radioactive decay in which a beta particle (an electron or positron) is emitted from an atomic nucleus, transforming a neutron into a proton or vice versa.
4.
FLASHCARD QUESTION
Front
What percentage of the parent isotope remains after 2 Half-Lives?
Back
25% of the parent isotope remains after 2 Half-Lives.
5.
FLASHCARD QUESTION
Front
If an isotope has a Half-Life of 5 days, how much of the original sample remains after 15 days?
Back
After 15 days (which is 3 Half-Lives), 12.5% of the original sample remains.
6.
FLASHCARD QUESTION
Front
How do you calculate the number of Half-Lives that have passed?
Back
To calculate the number of Half-Lives that have passed, divide the total time elapsed by the Half-Life of the isotope.
7.
FLASHCARD QUESTION
Front
What happens to the amount of the parent isotope over time?
Back
The amount of the parent isotope decreases over time as it decays into daughter isotopes.
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