Question 1

According to string theory,six space-time dimensions cannot be measured except as quantum numbers of internal particle properties because they are curled up in size of the order of A)10−³⁵ m. B)10−¹⁵ m. C)10−¹⁰ m. D)10−⁸ m. E)10−³ m.

Accepted Answer

The answer of According to string theory,six space-time dimensions cannot...

Question 2

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

Accepted Answer

The acceleration of the universe's expansion is influenced by all the components mentioned: standard matter (baryons and leptons), dark matter, and dark energy. Each plays a role in the universe's dynamics, with dark energy being the most significant contributor to the acceleration observed.

Question 3

The particle Δ⁺⁺ 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)uuu. B)uud. C)udd. D) . E) .

Accepted Answer

The answer of The particle Δ⁺⁺ has an electric charge...

Question 4

Of the following leptons,which has the greatest rest energy?
A) 
B) 
C) 
D) 
E)

Accepted Answer

The answer of Of the following leptons,which has the greatest...

Question 5

Calculate the range of the force that might be produced by the virtual exchange of a proton.(m_p = 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 6

Name at least one conservation law that prevents each of the following reactions: A)π⁻ + p → Σ⁺ + π° B)p → π⁺ + π⁺ + π⁻

Accepted Answer

The answer of Name at least one conservation law that...

Question 7

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

Accepted Answer

The answer of A Σ⁺ particle,composed of uus quarks,has the...

Question 8

A photon with an energy of Eγ = 2.090 0 GeV creates a proton-antiproton pair in which the proton has a kinetic energy of 95.0 MeV.What is the kinetic energy of the antiproton? (m_pc² = 938.3 MeV)

Accepted Answer

The answer of A photon with an energy of Eγ...

Question 9

The decay Is not possible because A)L_e is not conserved. B)Lμ is not conserved. C)quark number is not conserved. D)all of the above are not conserved. E)only L_e and Lμ are not conserved.

Accepted Answer

The answer of The decay Is not possible because A)L_e is...

Question 10

In the standard model of the expansion of the universe,the total energy of a standard mass m is assumed to be zero.When we solve the resulting energy equation for the critical mass density of the universe,we find that the critical mass density is given by
A)  .
B)  .
C)  .
D)  .
E)  .

Accepted Answer

The answer of In the standard model of the expansion...

Question 11

The three quarks in any baryon must all have different
A)baryon number.
B)color charge.
C)electric charge.
D)lepton number.
E)spin.

Accepted Answer

This is due to the Pauli Exclusion Principle, which states that no two quarks can occupy the same quantum state at the same time. Since the three quarks in a baryon are in the same spatial and energy state, they must have different color charges (red, green, or blue) to satisfy this principle.

Question 12

The particle reaction 
Cannot occur because
A)electric charge is not conserved.
B)strangeness is not conserved.
C)baryon number is not conserved.
D)all of the above are not conserved.
E)both (a)and (b)above are not conserved.

Accepted Answer

The conservation laws in particle physics are electric charge, strangeness, and baryon number. Option A states that electric charge is not conserved, and option B states that strangeness is not conserved. Therefore, the correct answer is E, which includes both options A and B.

Question 13

A K⁰ particle at rest decays into a π⁺ and a π⁻.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 is 139.6 MeV/c².

Accepted Answer

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

Question 14

If the quark content of the proton,p,is uud,the quark content of the antiproton, 
Is
A)uud.
B)udd.
C)  .
D)  .
E)  .

Accepted Answer

The answer of If the quark content of the proton,p,is...

Quiz 46: Particle Physics and Cosmology

According to string theory,six space-time dimensions cannot be measured except as quantum numbers of internal particle properties because they are curled up in size of the order of

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

The particle Δ⁺⁺ 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

Of the following leptons,which has the greatest rest energy?

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

Name at least one conservation law that prevents each of the following reactions: A)π⁻ + p → Σ⁺ + π° B)p → π⁺ + π⁺ + π⁻

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

A photon with an energy of Eγ = 2.090 0 GeV creates a proton-antiproton pair in which the proton has a kinetic energy of 95.0 MeV.What is the kinetic energy of the antiproton? (m_pc² = 938.3 MeV)

The decay Is not possible because

In the standard model of the expansion of the universe,the total energy of a standard mass m is assumed to be zero.When we solve the resulting energy equation for the critical mass density of the universe,we find that the critical mass density is given by

The three quarks in any baryon must all have different

The particle reaction Cannot occur because

A K⁰ particle at rest decays into a π⁺ and a π⁻.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 is 139.6 MeV/c².

If the quark content of the proton,p,is uud,the quark content of the antiproton, Is

Quiz 46: Particle Physics and Cosmology

According to string theory,six space-time dimensions cannot be measured except as quantum numbers of internal particle properties because they are curled up in size of the order of

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

The particle Δ++ 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

Of the following leptons,which has the greatest rest energy?

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)

Name at least one conservation law that prevents each of the following reactions: A)π− + p → Σ+ + π° B)p → π+ + π+ + π−

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

A photon with an energy of Eγ = 2.090 0 GeV creates a proton-antiproton pair in which the proton has a kinetic energy of 95.0 MeV.What is the kinetic energy of the antiproton? (mpc2 = 938.3 MeV)

The decay Is not possible because

In the standard model of the expansion of the universe,the total energy of a standard mass m is assumed to be zero.When we solve the resulting energy equation for the critical mass density of the universe,we find that the critical mass density is given by

The three quarks in any baryon must all have different

The particle reaction Cannot occur because

A K0 particle at rest decays into a π+ and a π−.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 is 139.6 MeV/c2.

If the quark content of the proton,p,is uud,the quark content of the antiproton, Is

The particle Δ⁺⁺ 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

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

Name at least one conservation law that prevents each of the following reactions: A)π⁻ + p → Σ⁺ + π° B)p → π⁺ + π⁺ + π⁻

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

A photon with an energy of Eγ = 2.090 0 GeV creates a proton-antiproton pair in which the proton has a kinetic energy of 95.0 MeV.What is the kinetic energy of the antiproton? (m_pc² = 938.3 MeV)

A K⁰ particle at rest decays into a π⁺ and a π⁻.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 is 139.6 MeV/c².