Draw a diagram similar to Figure to show β + - dacay. A visual representation of the change within the neutron as it decays into a proton.

Diagram showing β + decay. In β + decay an up quark changes into down quark with the emission of a positron and a neutrino. The quarks are held together in the nucleus by the strong nuclear force. This acts only over a very short range, around 10 - 15 m and is also responsible for holding the neutrons and protons together in the nucleus.

Write an equation to describe the changes in β + - decay. A visual representation of the change within the neutron as it decays into a proton.

Diagram showing β + decay. In β + decay an up quark changes into down quark with the emission of a positron and a neutrino. The equation of β + decay is u → d + e 1 0 + ν .

E M B I B E

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 15 - Atomic Structure and Particle Physics>Questions>Q 15

EASY

AS and A Level

IMPORTANT

Earn 100

A $ρ$ -meson is made up of an up quark and an antidown quark. Calculate its charge.

Important Questions on Atomic Structure and Particle Physics

EASY

AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 15 - Atomic Structure and Particle Physics>Questions>Q 16

Suggest which quarks or antiquarks make up a

π^{-}

meson.

EASY

AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 15 - Atomic Structure and Particle Physics>Questions>Q 17

Show that the

ϕ

-meson is neutral.

EASY

AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 15 - Atomic Structure and Particle Physics>Question>Q 18

Draw a diagram similar to Figure to show $β^{+}$ - dacay.

Question Image

A visual representation of the change within the neutron as it decays into a proton.

EASY

AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 15 - Atomic Structure and Particle Physics>Question>Q 18

Write an equation to describe the changes in $β^{+}$ - decay.

Question Image

A visual representation of the change within the neutron as it decays into a proton.

EASY

AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 15 - Atomic Structure and Particle Physics>Questions>Q 19

The equation ${}_{1}^{1}p \to {}_{0}^{1}n + {}_{+ 1}^{0}β + ν$ represents $β^{+}$ decay.

Use the equation to explain why the neutrino $ν$ can have no charge and very little mass.

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AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 15 - Atomic Structure and Particle Physics>Questions>Q 20

What are the differences between a proton, a positron and a photon? You can describe how their masses differ, how their charges differ or whether they are

particles or antiparticles.

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AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 15 - Atomic Structure and Particle Physics>Questions>Q 21

State two differences between hadrons and leptons.

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AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 15 - Atomic Structure and Particle Physics>REFLECTION

We have mentioned that quarks have different properties known as strangeness, charm, upness and downness. What is charm? What is strangeness? And what is electric charge?