Question 1

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 2

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

Accepted Answer

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

Question 3

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 4

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

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 5

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

Accepted Answer

In string theory, the extra dimensions are compactified at the Planck length, which is approximately 10^-35 meters.

Question 6

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

Accepted Answer

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

Question 7

The three quarks in any baryon must all have different

Accepted Answer

This is because of the Pauli exclusion principle, which states that no two identical fermions (particles with half-integer spin) can occupy the same quantum state simultaneously. Since quarks are fermions, three quarks in a baryon must have different color charges (red, green, blue or anti-red, anti-green, anti-blue).

Question 8

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

Accepted Answer

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

Question 9

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 10

The decay  is not possible because

Accepted Answer

The answer of The decay  is not possible because
...

Question 11

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

Accepted Answer

The critical mass density of the universe is given by the formula ρ_crit = 3H^2/8πG, where H is the Hubble constant and G is the gravitational constant. The value of H currently estimated by observations is about 70 km/s/Mpc, and G is a well-known constant. Plugging these values into the formula gives a critical density of approximately 5.5 x 10^-30 g/cm^3. Converting this to scientific notation with the same number of significant figures as in the answer choices gives the value in choice B: 11eb6adc_ed7c_0830_b0cf_c715bd7fcc01_TB8245_11.

Question 12

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

Accepted Answer

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

Question 13

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 14

The particle reaction  cannot occur because

Accepted Answer

The answer of The particle reaction  cannot occur because
...

Quiz 46: Particle Physics and Cosmology

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)

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

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.

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

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

The three quarks in any baryon must all have different

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)

The decay is not possible because