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DP IB Physics: SL

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Home / IB / Physics: SL / DP / Topic Questions / 7. Atomic, Nuclear & Particle Physics / 7.3 The Structure of Matter / Multiple Choice

7.3 The Structure of Matter

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Question 1

Marks: 1

The decay of a $Σ^{+}$ baryon is given by the equation

$Σ^{+} \to X + p$

Which row, A to D in the table, correctly identifies the charge, baryon number and lepton number of particle X?

	Charge	Baryon number	Lepton number
A.	–1	0	0
B.	0	0	0
C.	1	1	0
D.	0	–1	1

Key Concepts

Particle Conservation Laws

Question 2

Marks: 1

Which row in the table gives the correct quark combination for the particle?

	particle	category	quark combination
A.	proton	baryon	$u d d$
B.	positive pion	meson	$u d$
C.	neutron	meson	$u d d$
D.	negative pion	meson	$u d$

Key Concepts

Quarks & Leptons
Hadrons, Baryons & Mesons

Question 3

Marks: 1

This Feynman diagram shows particles interacting via a W^–boson.

q13_the-structure-of-matter_ib-sl-physics-mcq

Which of the following particle choices are correct?

	1	2	3	4
A.	proton	neutron	electron neutrino	β^– particle
B.	neutron	proton	electron neutrino	β^– particle
C.	up quark	down quark	β^– particle	anti–electron neutrino
D.	down quark	up quark	anti–electron neutrino	β^– particle

Key Concepts

Feynman Diagrams
Exchange Particles

Question 4

Marks: 1

The decay of a neutral kaon $K^{0}$ is given by the equation

$K^{0} \to X + Y + {\bar{v}}_{e}$

What must particles X and Y be?

$π^{+}$ and $e^{-}$
$π -$ and $e^{+}$
$μ^{+}$ and $e^{-}$
$π^{+}$ and $μ^{-}$

Key Concepts

Particle Conservation Laws

Question 5

Marks: 1

A pion can decay to produce two leptons.

Which of the following reactions is possible?

$π^{0} \to μ^{+} + ν_{e}$
$π^{0} \to π^{+} + μ^{-}$
$π^{+} \to e^{+} + ν_{μ}$
$π^{+} \to μ^{+} + ν_{μ}$

Key Concepts

Particle Conservation Laws

Question 6

Marks: 1

This Feynman diagram shows particles interacting leading to the production of a β⁺ particle.

q16_the-structure-of-matter_ib-sl-physics-mcq

Which of the following particle choices are correct?

	1	2	3	4
A.	proton	neutrino	W⁺ boson	neutron
B.	up quark	antineutrino	W⁺ boson	down quark
C.	proton	neutrino	W^- boson	neutron
D.	up quark	antineutrino	W^- boson	down quark

Key Concepts

Exchange Particles
Feynman Diagrams

Question 7

Marks: 1

Which row in the table, A to D, includes a valid particle for every column?

	Stable	Interacts via weak force	Interacts via electromagnetic force	Interacts via strong force
A.	antiproton	muon	proton	neutrino
B.	proton	electron	muon	neutron
C.	electron	proton	neutron	proton
D.	kaon	neutron	electron	pion

Key Concepts

Fundamental Forces
Comparing Fundamental Forces

Question 8

Marks: 1

The following Feynman diagram shows the baryons and leptons in a nuclear decay.

q18_the-structure-of-matter_ib-sl-physics-mcq

Which of the four Feynman diagrams, A to D, is physically equivalent to the diagram given for this decay?

q18-2_the-structure-of-matter_ib-sl-physics-mcq

Key Concepts

Feynman Diagrams
Quarks & Leptons

Question 9

Marks: 1

In the Geiger–Marsden experiment, alpha particles are used to investigate scattering by gold atoms.

What do the results of the experiment provide evidence for?

charge is distributed evenly throughout an atom
the nucleus is comprised of protons and neutrons
alpha particles have discrete amounts of kinetic energy
most of the mass and all of the positive charge of an atom is contained in a small volume

Key Concepts

The Rutherford-Geiger-Marsden Experiment

Question 10

Marks: 1

Which of the following statements correctly describes why quarks were first hypothesised?

To account for patterns in properties of elementary particles
To describe nuclear emission and absorption spectra
To account for the missing energy and momentum in beta decay
To explain the existence of isotopes

Key Concepts

The Standard Model of Particle Physics
Quarks & Leptons

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