Exam 44: Particle Physics and Cosmology

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The background microwave radiation,discovered in 1965 by Penzias and Wilson,has its peak intensity at a wavelength of 1.06 mm.What blackbody temperature does this wavelength imply for the universe? (σ = 5.670 × 10^-8 W/m² • K⁴,Wien displacement law constant is 2.90 × 10^-3 m • K)

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Question 41

A cyclotron of radius 0.25 m accelerates protons in a 1.7-T magnetic field.What is the frequency for the applied alternating voltage? (m_proton = 1.67 × 10^-27 kg,

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Question 42

Hadrons are divided into two subgroups called

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Question 43

The cosmic background radiation corresponds to a temperature of about

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Question 44

Redshift measurements on a galaxy show that it is receding from us with a velocity of 7240 km/s.Estimate how far away the galaxy is if the Hubble constant is 22 km/s per million light-years.(c = 3.00 × 10⁸ m/s,1 ly = 9.461 × 10¹⁵ m,1 y = 3.156 × 10⁷ s)

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Question 45

If the Hubble constant is 25 km/s per million light-years,use it to estimate the age of the universe? (c = 3.00 × 10⁸ m/s,1 ly = 9.461 × 10¹⁵ m,1 y = 3.156 × 10⁷ s)

(Multiple Choice)

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Question 46

What type of particle is a proton? (There may be more than one correct choice.)

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Question 47

How long after the Big Bang did nucleosynthesis,the combining of protons and neutrons together to form nuclei,begin to occur?

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Question 48

Dark energy was discovered as astronomers studied

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Question 49

A galaxy is observed receding from Earth with a speed of 2800 km/s.If the Hubble constant is 22 km/s per million light-years,estimate how many years ago the light that we presently see from the galaxy actually left the galaxy.(c = 3.00 × 10⁸ m/s,1 ly = 9.461 × 10¹⁵ m,

(Multiple Choice)

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Question 50

Estimate the speed of a galaxy away from us if it is 10 billion light-years from us and if the Hubble constant is 22 km/s per million light-years.(c = 3.00 × 10⁸ m/s, , 1 y = 3.156 × 10⁷ s)

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Question 51

A cyclotron is designed with a magnet that produces a magnetic field of 1.2 T.When refurbished,the magnet is replaced by one that produces a 1.5-T field.How does the maximum kinetic energy achieved by the protons change compared to their previous maximum kinetic energy?

(Multiple Choice)

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Question 52

Dark energy accounts for what percent of the known energy in the universe?

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Question 53

The universe first became transparent to most light,coinciding with the origin of the cosmic background radiation,when the universe cooled enough to allow the formation of

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Question 54

Showing 41 - 54 of 54

Exam 44: Particle Physics and Cosmology

The background microwave radiation,discovered in 1965 by Penzias and Wilson,has its peak intensity at a wavelength of 1.06 mm.What blackbody temperature does this wavelength imply for the universe? (σ = 5.670 × 10-8 W/m2 • K4,Wien displacement law constant is 2.90 × 10-3 m • K)

A cyclotron of radius 0.25 m accelerates protons in a 1.7-T magnetic field.What is the frequency for the applied alternating voltage? (mproton = 1.67 × 10-27 kg,

Hadrons are divided into two subgroups called

The cosmic background radiation corresponds to a temperature of about

Redshift measurements on a galaxy show that it is receding from us with a velocity of 7240 km/s.Estimate how far away the galaxy is if the Hubble constant is 22 km/s per million light-years.(c = 3.00 × 108 m/s,1 ly = 9.461 × 1015 m,1 y = 3.156 × 107 s)

If the Hubble constant is 25 km/s per million light-years,use it to estimate the age of the universe? (c = 3.00 × 108 m/s,1 ly = 9.461 × 1015 m,1 y = 3.156 × 107 s)

What type of particle is a proton? (There may be more than one correct choice.)

How long after the Big Bang did nucleosynthesis,the combining of protons and neutrons together to form nuclei,begin to occur?

Dark energy was discovered as astronomers studied

A galaxy is observed receding from Earth with a speed of 2800 km/s.If the Hubble constant is 22 km/s per million light-years,estimate how many years ago the light that we presently see from the galaxy actually left the galaxy.(c = 3.00 × 108 m/s,1 ly = 9.461 × 1015 m,

Estimate the speed of a galaxy away from us if it is 10 billion light-years from us and if the Hubble constant is 22 km/s per million light-years.(c = 3.00 × 108 m/s, , 1 y = 3.156 × 107 s)

A cyclotron is designed with a magnet that produces a magnetic field of 1.2 T.When refurbished,the magnet is replaced by one that produces a 1.5-T field.How does the maximum kinetic energy achieved by the protons change compared to their previous maximum kinetic energy?

Dark energy accounts for what percent of the known energy in the universe?

The universe first became transparent to most light,coinciding with the origin of the cosmic background radiation,when the universe cooled enough to allow the formation of

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The background microwave radiation,discovered in 1965 by Penzias and Wilson,has its peak intensity at a wavelength of 1.06 mm.What blackbody temperature does this wavelength imply for the universe? (σ = 5.670 × 10^-8 W/m² • K⁴,Wien displacement law constant is 2.90 × 10^-3 m • K)

A cyclotron of radius 0.25 m accelerates protons in a 1.7-T magnetic field.What is the frequency for the applied alternating voltage? (m_proton = 1.67 × 10^-27 kg,

Redshift measurements on a galaxy show that it is receding from us with a velocity of 7240 km/s.Estimate how far away the galaxy is if the Hubble constant is 22 km/s per million light-years.(c = 3.00 × 10⁸ m/s,1 ly = 9.461 × 10¹⁵ m,1 y = 3.156 × 10⁷ s)

If the Hubble constant is 25 km/s per million light-years,use it to estimate the age of the universe? (c = 3.00 × 10⁸ m/s,1 ly = 9.461 × 10¹⁵ m,1 y = 3.156 × 10⁷ s)

A galaxy is observed receding from Earth with a speed of 2800 km/s.If the Hubble constant is 22 km/s per million light-years,estimate how many years ago the light that we presently see from the galaxy actually left the galaxy.(c = 3.00 × 10⁸ m/s,1 ly = 9.461 × 10¹⁵ m,

Estimate the speed of a galaxy away from us if it is 10 billion light-years from us and if the Hubble constant is 22 km/s per million light-years.(c = 3.00 × 10⁸ m/s, , 1 y = 3.156 × 10⁷ s)