Nuclear Decay

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  • Created by: tahliaD
  • Created on: 11-10-15 22:05
Name two types of decay
Alpha, Beta-minus
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How many protons does an atom have to have at least in order for alpha decay to take place?
More than 82
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What atom is an alpha particle the nucleus of?
Helium
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How many protons does an atom lose in alpha decay?
2
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By how much does the mass number decrease by during alpha decay?
4
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Name two elements that alpha decay can occur in
Uranium, Radium (or element with more than 82 protons)
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What is the range of alpha radiation?
a few cm
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In what can you view the trace of alpha radiation?
Cloud Chamber
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Name a device used to measure ionising radiation
Geiger Counter, Spark Counter
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Give the general formula for Alpha decay
a^x^z ---> a-4^Y^z-2 + 4^α^2
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What is nuclear decay?
When unstable nuclei decay by emitting particles to become more stable nuclei
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Why does nuclear decay occur?
The strong force's attractive range is small and therefore can't keep larger nuclei together
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Give another name for a Beta-Minus partlicle
electron
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Give the general formula for Beta-minus decay
a^X^z ----> a^Y^z+1 + β- + ̅νe
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What happens during beta minus decay?
A neutron in the nucleus turns into a proton, an electron is emitted along with an anti-neutrino
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Which sub-atomic particle has to be rich whitin the nucleus for beta-minus decay to occur?
neutrons
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What does the antineutrino particle carry away with it?
Some energy and some momentum
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Give a rough range for beta radiation
a few metres in air
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Why did they theorise the existence the neutrino?
After Beta-minu decay, there were less energy and momentum in the products than in the original atoms, which didn't fit in with the conservation of energy
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Who theorised this?
Pauli Woolfgang
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What did he theorise the particles qualities to be?
No charge (conservation of charge), almost 0 mass (never been detected)
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When was the neutrino observed?
25 years later
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When did Pauli Woolfgang propose his hypothesis?
1930
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Other cards in this set

Card 2

Front

How many protons does an atom have to have at least in order for alpha decay to take place?

Back

More than 82

Card 3

Front

What atom is an alpha particle the nucleus of?

Back

Preview of the front of card 3

Card 4

Front

How many protons does an atom lose in alpha decay?

Back

Preview of the front of card 4

Card 5

Front

By how much does the mass number decrease by during alpha decay?

Back

Preview of the front of card 5
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