Question 1

If a K0 meson at rest decays in 0.89 *10-10 s, how far will a K0 meson moving at 0.96 c travel through a bubble chamber?

Accepted Answer

A) 17 cm 
B) 1.1 cm 
C) 53 cm 
D) 42 mm 
E) 9.2 cm 
A) 17 cm 
B) 1.1 cm 
C) 53 cm 
D) 42 mm 
E) 9.2 cm E

Question 2

Which of the following reactions cannot occur?

Accepted Answer

A) $ \mathrm{n} \rightarrow \mathrm{p}+\mathrm{e}^{-}+\bar{v}_{e} $ 
B) $ \mathrm{p}+\mathrm{n} \rightarrow \mathrm{p}+\mathrm{p}+\overline{\mathrm{p}} $ 
C) $\mu^{-} \rightarrow \mathrm{e}^{-}+\bar{v}_{e}+v_{\mu}$ 
D) $\bar{\pi} \rightarrow \bar{\mu}+v_{\mu}$ 
E) $\pi^{+} \rightarrow \mu^{+}+\bar{v}_{\mu}$ 
A) $ \mathrm{n} \rightarrow \mathrm{p}+\mathrm{e}^{-}+\bar{v}_{e} $ 
B) $ \mathrm{p}+\mathrm{n} \rightarrow \mathrm{p}+\mathrm{p}+\overline{\mathrm{p}} $ 
C) $\mu^{-} \rightarrow \mathrm{e}^{-}+\bar{v}_{e}+v_{\mu}$ 
D) $\bar{\pi} \rightarrow \bar{\mu}+v_{\mu}$ 
E) $\pi^{+} \rightarrow \mu^{+}+\bar{v}_{\mu}$ B

Question 3

In this course we have seen that baryons have inertial and gravitational mass, intrinsic angular momentum, and other internal properties that have been given names like baryon number, strangeness, charm, etc.The Standard Model's explanation for these properties of baryons is that:

Accepted Answer

A) the baryons are states of something more elementary that can exist in multiple quantum states. 
B) the leptons are states of something more elementary that can exist in multiple quantum states. 
C) photons are states of something more elementary that can exist in multiple quantum states. 
D) according to the Heisenberg Uncertainty Principle quantum numbers are indeterminate. 
E) quarks are states of something more elementary that can exist in multiple quantum states. 
A) the baryons are states of something more elementary that can exist in multiple quantum states. 
B) the leptons are states of something more elementary that can exist in multiple quantum states. 
C) photons are states of something more elementary that can exist in multiple quantum states. 
D) according to the Heisenberg Uncertainty Principle quantum numbers are indeterminate. 
E) quarks are states of something more elementary that can exist in multiple quantum states. A

Question 4

The following reaction can occur by the strong interaction:  $\pi$0 + n $\rightarrow$  K+ + $\Sigma$-.If the quark composition of the n is (udd), the $\pi$$\degree$ is (), and the composition of the K+ is (), find the quark composition of the $\Sigma$-.

Accepted Answer

A) sss 
B) uds 
C) dds 
D)  $d d \bar{s}$ 
E)  $\overline{\mathrm{u}} \mathrm{~s}$ 
A) sss 
B) uds 
C) dds 
D)  $d d \bar{s}$ 
E)  $\overline{\mathrm{u}} \mathrm{~s}$

Question 5

The particle $\Delta$++ has an electric charge twice that of the proton and baryon number +1.Strangeness, charm, bottomness and topness are all 0.Its quark composition must be:

Accepted Answer

A) uuu. 
B) uud. 
C) udd. 
D)  $u \overline{d d}$ 
E)  $\overline{d d d}$ 
A) uuu. 
B) uud. 
C) udd. 
D)  $u \overline{d d}$ 
E)  $\overline{d d d}$

Question 6

According to the Hubble law, where H = 17 km/s/106 light-years, what is the velocity of recession of a quasar at a distance of 2 billion light-years from Earth?

Accepted Answer

A) 0.75 c 
B) 0.33 c 
C) 0.55 c 
D) 0.11 c 
E) 0.93 c 
A) 0.75 c 
B) 0.33 c 
C) 0.55 c 
D) 0.11 c 
E) 0.93 c

Question 7

A $\Sigma$+ particle, composed of uus quarks, has the same ____ as a proton.

Accepted Answer

A) baryon number and charm. 
B) baryon number and electric charge. 
C) baryon number and strangeness. 
D) baryon number, electric charge, and charm. 
E) electric charge and strangeness. 
A) baryon number and charm. 
B) baryon number and electric charge. 
C) baryon number and strangeness. 
D) baryon number, electric charge, and charm. 
E) electric charge and strangeness.

Question 8

The attractive force between protons and neutrons in the nucleus is brought about by the exchange of a virtual pi-meson (m $\pi$ = 140 MeV/c2).Estimate the longest time a virtual  $\pi$0 can exist, in accordance with the uncertainty principle .(1 eV = 1.6 * 10-19 J.)

Accepted Answer

A) 2.4 * 10-24 s 
B) 6.9 * 10-27 s 
C) 3.3 * 10-18 s 
D) 2.4 * 10-21 s 
E) 1.6 * 10-19 s 
A) 2.4 * 10-24 s 
B) 6.9 * 10-27 s 
C) 3.3 * 10-18 s 
D) 2.4 * 10-21 s 
E) 1.6 * 10-19 s

Question 9

Name at least one conservation law that prevents each of the following reactions:
a) $\pi$- + p $\rightarrow$ $\Sigma$+ +  $\pi$$\degree$
b)p$\rightarrow$  $\pi$+ +  $\pi$+ +  $\pi$-

Accepted Answer

a) charge,

Question 10

The decay is not possible because:

Accepted Answer

A) Le is not conserved. 
B) L$\mu$ is not conserved. 
C) quark number is not conserved. 
D) all of the above are not conserved. 
E) only Le and L$\mu$are not conserved. 
A) Le is not conserved. 
B) L$\mu$ is not conserved. 
C) quark number is not conserved. 
D) all of the above are not conserved. 
E) only Le and L$\mu$are not conserved.

Question 11

A proton and an antiproton each with total energy of 400 GeV collide head-on.What is the total energy (particles + energy) released?

Accepted Answer

A) zero 
B) 400 Gev 
C) 800 GeV 
D) 1600 GeV 
E) 2400 GeV 
A) zero 
B) 400 Gev 
C) 800 GeV 
D) 1600 GeV 
E) 2400 GeV

Question 12

The acceleration (or deceleration) of the expansion of the universe is determined by:

Accepted Answer

A) the standard matter, baryons and leptons. 
B) the dark matter in the universe. 
C) the dark energy in the universe. 
D) all of the above. 
E) only (b) and (c) above. 
A) the standard matter, baryons and leptons. 
B) the dark matter in the universe. 
C) the dark energy in the universe. 
D) all of the above. 
E) only (b) and (c) above.

Question 13

All particles can be classified into:

Accepted Answer

A) leptons and quarks. 
B) hadrons and leptons. 
C) baryons and leptons. 
D) mesons and baryons. 
A) leptons and quarks. 
B) hadrons and leptons. 
C) baryons and leptons. 
D) mesons and baryons.

Question 14

Particles composed of quarks are:

Accepted Answer

A) photons. 
B) leptons. 
C) neutrinos. 
D) W and Z bosons. 
E) baryons and mesons. 
A) photons. 
B) leptons. 
C) neutrinos. 
D) W and Z bosons. 
E) baryons and mesons.

Question 15

A model for how repulsive forces between two particles can be mediated by a third particle would be:

Accepted Answer

A) a person on a skateboard pushing against a wall. 
B) two people in two canoes throwing a ball back and forth. 
C) two people in two canoes each pulling on one end of a rope. 
D) two people in two skateboards giving each other a shove. 
E) two people in two skateboards each pulling on one end of a rope. 
A) a person on a skateboard pushing against a wall. 
B) two people in two canoes throwing a ball back and forth. 
C) two people in two canoes each pulling on one end of a rope. 
D) two people in two skateboards giving each other a shove. 
E) two people in two skateboards each pulling on one end of a rope.

Question 16

A K0 particle at rest decays into a $\pi$+ and a  $\pi$-.What will be the speed of each of the pions? The mass of the K0 is 497.7 MeV/c2 and the mass of each $\pi$ is 139.6 MeV/c2.

Accepted Answer

The answer of A K0 particle at rest decays into...

Question 17

Calculate the range of the force that might be produced by the virtual exchange of a proton.(mp = 1.67 *10-27 kg, h = 6.626 * 10-34 J . s)

Accepted Answer

The answer of Calculate the range of the force that...

Question 18

The strong nuclear interaction has a range of approximately 0.70 * 10-15 m.It is thought that an elementary particle is exchanged between the protons and neutrons, leading to an attractive force.Utilise the uncertainty principle to estimate the mass of the elementary particle if it moves at nearly the speed of light. $\Delta E \Delta t=h / 2$

Accepted Answer

A) 140 MeV/c2, a pion 
B) 511 keV/c2, an electron 
C) 96 GeV/c2, a Z boson 
D) 500 MeV/c2, a K meson 
E) 106 MeV/c2, a muon 
A) 140 MeV/c2, a pion 
B) 511 keV/c2, an electron 
C) 96 GeV/c2, a Z boson 
D) 500 MeV/c2, a K meson 
E) 106 MeV/c2, a muon

Question 19

The minimum energy needed to produce a positron is:

Accepted Answer

A) 3 MeV 
B) 2 MeV 
C) 1 MeV 
D) 4 MeV 
E) 0.51 MeV 
A) 3 MeV 
B) 2 MeV 
C) 1 MeV 
D) 4 MeV 
E) 0.51 MeV

Question 20

The law of conservation of baryon number is that:

Accepted Answer

A) the total number of baryons and leptons is conserved. 
B) the total number of baryons is conserved. 
C) the (number of baryons) - (number of antibaryons) is conserved. 
D) the total number of quarks is conserved. 
E) the (number of baryons) + (number of antibaryons) is conserved. 
A) the total number of baryons and leptons is conserved. 
B) the total number of baryons is conserved. 
C) the (number of baryons) - (number of antibaryons) is conserved. 
D) the total number of quarks is conserved. 
E) the (number of baryons) + (number of antibaryons) is conserved.

If a K0 meson at rest decays in 0.89 *10-10 s, how far will a K0 meson moving at 0.96 c travel through a bubble chamber?

Which of the following reactions cannot occur?

In this course we have seen that baryons have inertial and gravitational mass, intrinsic angular momentum, and other internal properties that have been given names like baryon number, strangeness, charm, etc.The Standard Model's explanation for these properties of baryons is that:

The particle $\Delta$ ++ has an electric charge twice that of the proton and baryon number +1.Strangeness, charm, bottomness and topness are all 0.Its quark composition must be:

According to the Hubble law, where H = 17 km/s/106 light-years, what is the velocity of recession of a quasar at a distance of 2 billion light-years from Earth?

A $\Sigma$ + particle, composed of uus quarks, has the same ____ as a proton.

Name at least one conservation law that prevents each of the following reactions: a) $\pi$ - + p $\rightarrow$ $\Sigma$ + + $\pi$ $\degree$ b)p $\rightarrow$ $\pi$ + + $\pi$ + + $\pi$ -

The decay is not possible because:

A proton and an antiproton each with total energy of 400 GeV collide head-on.What is the total energy (particles + energy) released?

The acceleration (or deceleration) of the expansion of the universe is determined by:

All particles can be classified into:

Particles composed of quarks are:

A model for how repulsive forces between two particles can be mediated by a third particle would be:

A K0 particle at rest decays into a $\pi$ + and a $\pi$ -.What will be the speed of each of the pions? The mass of the K0 is 497.7 MeV/c2 and the mass of each $\pi$ is 139.6 MeV/c2.

Calculate the range of the force that might be produced by the virtual exchange of a proton.(mp = 1.67 10-27 kg, h = 6.626 10-34 J . s)

The minimum energy needed to produce a positron is:

The law of conservation of baryon number is that:

Electric Fields

Gausss Law

Electric Potential

Energy and Capacitance

Current and Resistance

Direct-Current Circuits

Magnetic Fields

Magnetic Forces

Faradays Law

Inductance

Alternating-Current Circuits

Electromagnetic Waves

The Nature of Light and the Principles of Ray Optics

Image Formation

Wave Optics

Diffraction Patterns and Polarisation

Quantisation and Wave-Particle Duality

Introduction to Quantum Mechanics

Atomic Physics

Quantum Physics of Molecules and Solids

Nuclei and Radioactivity

Filters

Exam 22: Particle Physics

If a K0 meson at rest decays in 0.89 *10-10 s, how far will a K0 meson moving at 0.96 c travel through a bubble chamber?

Which of the following reactions cannot occur?

In this course we have seen that baryons have inertial and gravitational mass, intrinsic angular momentum, and other internal properties that have been given names like baryon number, strangeness, charm, etc.The Standard Model's explanation for these properties of baryons is that:

The following reaction can occur by the strong interaction: π\piπ 0 + n →\rightarrow→ K+ + Σ\SigmaΣ -.If the quark composition of the n is (udd), the π\piπ°\degree° is (), and the composition of the K+ is (), find the quark composition of the Σ\SigmaΣ -.

The particle Δ\DeltaΔ ++ has an electric charge twice that of the proton and baryon number +1.Strangeness, charm, bottomness and topness are all 0.Its quark composition must be:

According to the Hubble law, where H = 17 km/s/106 light-years, what is the velocity of recession of a quasar at a distance of 2 billion light-years from Earth?

A Σ\SigmaΣ + particle, composed of uus quarks, has the same ____ as a proton.

The attractive force between protons and neutrons in the nucleus is brought about by the exchange of a virtual pi-meson (m π\piπ = 140 MeV/c2).Estimate the longest time a virtual π\piπ 0 can exist, in accordance with the uncertainty principle .(1 eV = 1.6 * 10-19 J.)

Name at least one conservation law that prevents each of the following reactions: a) π\piπ - + p →\rightarrow→ Σ\SigmaΣ + + π\piπ°\degree° b)p →\rightarrow→ π\piπ + + π\piπ + + π\piπ -

The decay is not possible because:

A proton and an antiproton each with total energy of 400 GeV collide head-on.What is the total energy (particles + energy) released?

The acceleration (or deceleration) of the expansion of the universe is determined by:

All particles can be classified into:

Particles composed of quarks are:

A model for how repulsive forces between two particles can be mediated by a third particle would be:

A K0 particle at rest decays into a π\piπ + and a π\piπ -.What will be the speed of each of the pions? The mass of the K0 is 497.7 MeV/c2 and the mass of each π\piπ is 139.6 MeV/c2.

Calculate the range of the force that might be produced by the virtual exchange of a proton.(mp = 1.67 *10-27 kg, h = 6.626 * 10-34 J . s)

The minimum energy needed to produce a positron is:

The law of conservation of baryon number is that:

Electric Fields

Gausss Law

Electric Potential

Energy and Capacitance

Current and Resistance

Direct-Current Circuits

Magnetic Fields

Magnetic Forces

Faradays Law

Inductance

Alternating-Current Circuits

Electromagnetic Waves

The Nature of Light and the Principles of Ray Optics

Image Formation

Wave Optics

Diffraction Patterns and Polarisation

Quantisation and Wave-Particle Duality

Introduction to Quantum Mechanics

Atomic Physics

Quantum Physics of Molecules and Solids

Nuclei and Radioactivity

Filters

The particle $\Delta$ ++ has an electric charge twice that of the proton and baryon number +1.Strangeness, charm, bottomness and topness are all 0.Its quark composition must be:

A $\Sigma$ + particle, composed of uus quarks, has the same ____ as a proton.

Name at least one conservation law that prevents each of the following reactions: a) $\pi$ - + p $\rightarrow$ $\Sigma$ + + $\pi$ $\degree$ b)p $\rightarrow$ $\pi$ + + $\pi$ + + $\pi$ -

A K0 particle at rest decays into a $\pi$ + and a $\pi$ -.What will be the speed of each of the pions? The mass of the K0 is 497.7 MeV/c2 and the mass of each $\pi$ is 139.6 MeV/c2.

Calculate the range of the force that might be produced by the virtual exchange of a proton.(mp = 1.67 10-27 kg, h = 6.626 10-34 J . s)