3.2.1.7 Applications of conservation laws

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AQA A-Level Physics

Physics

11th

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1
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Beta decay occurs because of what interaction?
Beta decay occurs because of the weak interaction between quarks.
2
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Why does a neutron turn into a proton in beta minus decay?
A neutron turns into a proton because a down quark turns into an up quark.
A neutron turns into a proton because a down quark turns into an up quark.
3
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Why does a proton turn into a neutron in beta plus decay?
A proton turns into a neutron in beta plus decay as an up quark turns into a down quark
A proton turns into a neutron in beta plus decay as an up quark turns into a down quark
4
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What does the W^- boson do in beta minus decay?
The W^- boson ‘carries away’ the negative charge of the down quark (that turns into an up quark) which provides the negative charge for the electron and antineutrino.
The W^- boson ‘carries away’ the negative charge of the down quark (that turns into an up quark) which provides the negative charge for the electron and antineutrino.
5
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What does the W^+ boson do in beta plus decay?
The W+ boson ‘carries away’ the positive charge of the up quark (which turns into the down quark) which provides the positive charge for the positron and neutrino.
The W+ boson ‘carries away’ the positive charge of the up quark (which turns into the down quark) which provides the positive charge for the positron and neutrino.
6
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What four things are always conserved in an interaction?
Things that are conserved in an interaction:

* baryon number
* lepton number
* energy
* momentum