Particle Physics Questions : Multiple Choice

 

Q1. What are the numbers of hadrons, baryons and mesons in an atom of ?

	hadrons	baryons	mesons
A	7	3	3
B	7	4	4
C	7	7	0
D	10	7	0

    

Q2. A radioactive nucleus emits a β^– particle then an α-particle and finally another β^– particle.

The final nuclide is:

A	an isotope of the original element
B	the same element with a different proton number
C	a new element of higher proton number
D	a new element of lower nucleon number

 

Q3. The nucleus of  captures a proton and emits an α particle.

What is the product nucleus?

A         

      
B         

      
C         

      
D             

 

Q4. Electron capture can be represented by the equation:   

 p + e^- → X + Y

Which row correctly identifies X and Y?

	X	Y
A	p	K-
B	e-	e+
C	n	νe
D	n	π0

Q5. A calcium ion is formed by removing two electrons from an atom of  .

What is the specific charge of the calcium ion?

A	3.2 × 10-19 C kg-1
B	2.9 × 10-18 C kg-1
C	4.8 × 106 C kg-1
D	4.8 × 107 C kg-1

 

Q6. The table below links exchange particles with nuclear processes. Select the line that does not give the correct exchange particle for the process.

	Process	Exchange Particle
A	gravitational attraction	Z boson
B	electrostatic repulsion of electrons	virtual photon
C	strong interaction	pion
D	β− decay	W boson

 

Q7. Select the line that gives the correct category and quark combination for the particle.

	Particle	Category	Quark combination
A	neutron	baryon	̅u̅ d
B	neutron	meson	u d d
C	proton	baryon	u u d
D	positive pion	meson	̅u̅ d

 

Q8. Select the incorrect statement about muons from the following.

A	A muon is a lepton
B	A muon has a greater mass than an electron.
C	If a muon and an electron each have the same de Broglie wavelength then they each have the same momentum.
D	A muon with the same momentum as an electron has a larger kinetic energy than the electron.

 

Q9. Which of the following nuclei has the smallest specific charge?

A
B
C
D

 

Q10. is an unstable nuclide in a radioactive decay series. It decays by emitting an α particle. The next two nuclides in the series emit β⁻ particles. Determine which nuclide is formed after these three decay processes have taken place.

A
B
C
D

 

Q11.

A CERN detector shows a signal only in the hadronic calorimeter. No signal is observed in the in the tracker, electromagnetic calorimeter or muon chambers). Therefore, this signal is most likely due to a:

A	pion
B	neutrino
C	photon
D	neutron

 

Q12.

The exchange particles carrying the strong nuclear force are the:

A	photons
B	gluons
C	gravitons
D	w-bosons

 

Q13.

Which was the first particle discovered which is still today believed to be elementary, i.e. not made up of further constituents?

A	electron
B	gluon
C	photon
D	proton

 

Q14. Which of the following is not true?

A	Each meson consists of a single quark and a single antiquark.
B	Each baryon consists of three quarks.
C	The magnitude of the charge on every quark is 1/3
D	A particle consisting of a single quark has not been observed.