What happens to the rate of radioactive decay if the temperature is doubled?
It stays the same
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Why did most alpha particles pass straight throughthe foil in Rutherford's experiment?
Most of the atom is empty space
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What did the alpha particle scattering experiment suggest about the structure of the nucleus?
The nucleus is where most of the mass of the atom is concentrated, very small and positively charged
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What is the relative charge of an alpha particle?
+2
5 of 24
What is the relative charge of a beta particle?
-1
6 of 24
Which type of nuclear radiation is the least penetrating?
Alpha
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Which type of nuclear radiation is the least ionising?
Gamma
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What happens to the count rate of a radioactive sample over time?
It decreases
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What has happened to the original count rate of a radioactive sample after two half-lives have passed?
It has decreased to one quarter of its original value
10 of 24
Why isn't an alpha source used as a tracer in medicine?
Alpha particles are very poorly penetrating, so they would not be detected outside the body/Alpha is very ionising so would be damaging to the patient
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Why do medical tracers have half-lives of just a few hours
To allow time to complete the procedure but minimise unnecessary exposure of the patient
12 of 24
What is the effect of pressure on the rate of radioactive decay?
It has no effect
13 of 24
What is background radiation?
Radiation that is around us all the time
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What was the Rutherford's alpha scattering experiment?
Firing alpha particles at a thin metal
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What happens to the mass number of a nucleus when it emits a beta particle?
It stays the same
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What happens to the atomic number of a nucleus when it emits a beta particle?
It goes up by 1
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What happens to the mass number of a nucleus when it emits an alpha particle?
It goes down by 4
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What happens to the atomic number of a nucleus when it emits an alpha particle?
It goes down by 2
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Why is gamma radiation not deflected by electric and magnetic fields?
Gamma radiation is uncharged.
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What has happened tothe number of atoms undergoing nuclear decay in a sample after three half-lived have passed?
It has decreased to one-eighth of its original value
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Why is alpha radiation unsuitable for monitoring thickness of metal foil?
Alpha radiation would no be able to pass through the foil, irrespective of thickness
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A radioactive isotope has a half-life of seven hours. A sample of the isotope has a mass of 4 milligrams. What mass of the isotope has decayed after 14 hours?
3 milligrams
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A sample of a radioactive isotope contains 100 000 atoms of the isotope. How many atoms of the isotope will remain after three half lives?
12 500
24 of 24
Other cards in this set
Card 2
Front
What happens to the rate of radioactive decay if the temperature is doubled?
Back
It stays the same
Card 3
Front
Why did most alpha particles pass straight throughthe foil in Rutherford's experiment?
Back
Card 4
Front
What did the alpha particle scattering experiment suggest about the structure of the nucleus?
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