7.3 The Structure of Matter

Question 1

Marks: 1

The diagram is an example of a ‘baryon decuplet’. Baryons are organised along horizontal and diagonal axes, as shown in the diagram below.

7-3-sl-mcq-hard-q1-phy

What is the quark structure of the $Ξ^{* -}$ bayron?

$\bar{u} s$
$u s s$
$d s s$
$u d s$

Question 2

Marks: 1

A collision between particles creates 4 mesons:

$s \bar{u} + d \bar{s} + X + Y$

The overall charge and strangeness of the 4 mesons is zero.

What are possible quark combinations for X and Y?

	X	Y
A	$d \bar{u}$	$s \bar{d}$
B	$u \bar{s}$	$u \bar{d}$
C	$s \bar{s}$	$u \bar{d}$
D	$u \bar{s}$	$s \bar{s}$

Question 3

Marks: 1

The $Σ^{0}$ baryon has strangeness of −1 and is produced through the strong interaction between a $π^{+}$ meson and a neutron.

$π^{+} + n \to Σ^{0} + X$

What is the quark composition of particle X?

$u \bar{s}$
$u u d$
$u \bar{d}$
$u u s$

Question 4

Marks: 1

Particles can be organised in a plot known as the ‘eightfold way’, as shown in the diagram below.

7-3-sl-mcq-hard-q4-phy

What are the quark compositions of Σ⁺, Σ^–, Ξ⁰ and Ξ^–?

	Σ⁺	Σ^–	Ξ⁰	Ξ^–
A	$u u s$	$d d s$	$u d s$	$d s s$
B	$u u d$	$d s s$	$u d d$	$d d d$
C	$u u s$	$d d s$	$u s s$	$d s s$
D	$u u d$	$d d d$	$u s s$	$d d s$

Question 5

Marks: 1

The K^– is an example of a meson with strangeness –1.

Which of the following combinations of particles could the K^– particle decay to?

$π^{+} + π^{-} + e^{-}$
$π^{0} + π^{-} + n$
$π^{-} + e^{-} + {\bar{v}}_{e}$
$π^{0} + μ^{-} + {\bar{v}}_{μ}$

Question 6

Marks: 1

Which of the four hadrons shown could be Ξ⁰?

7-3-sl-mcq-hard-q6-phy

Question 7

Marks: 1

None of the following decay equations for baryons are permitted.

Equation 1: $n \to p + ⅇ^{-} + v_{e}$

Equation 2: $Δ^{+} \to π^{+} + π^{0}$

Equation 3: $p \to n + e^{-} + v_{e}$

Equation 4: $\equiv^{0} \to p + \bar{v} + π^{0}$

Which property is not conserved in each equation?

	Equation 1	Equation 2	Equation 3	Equation 4
A	charge	baryon number	charge and lepton number	baryon number
B	lepton number	baryon number	charge and lepton number	charge and lepton number
C	baryon number	lepton number	baryon number	lepton number and baryon number
D	lepton number	charge	charge	charge

Question 8

Marks: 1

The charmed sigma particle, $Σ_{c}^{+ +}$ decays through the following equation:

$Σ_{c}^{+ +} \to Λ_{c}^{+} + π^{+}$

Both $Σ_{c}^{+ +}$ and $Λ_{c}^{+}$ contain one charm quark and have strangeness of 0.

Which of the following could be the quark structure of the $Σ_{c}^{+ +}$ and the $Λ_{c}^{+}$ ?

	$Σ_{c}^{+ +}$	$Λ_{c}^{+}$
A	$d d c$	$\bar{u} c$
B	$u d c$	$d s c$
C	$u u c$	$u d c$
D	$u d c$	$u u c$

Question 9

Marks: 1

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

7-3-sl-mcq-hard-q9-phy

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

7-3-sl-mcq-hard-q9_2-phy

Question 10

Marks: 1

The Higgs Boson was discovered at CERN in 2012. It is not stable and decays into other particles.

Which of the following could not be a possible decay pathway for the Higgs Boson?

$W^{+} + W^{-}$
$p + e^{-} + ν_{e}$
$γ γ$
$b \bar{b}$

DP IB Physics: HL

Topic Questions

7.3 The Structure of Matter

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Question 9

Question 10

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