Question 1

The scientific community now thinks that

Accepted Answer

A)  the universe was formed in an explosion that took place between 10 and 15 billion years ago. 
B)  new matter is continuously being created in the space between the galaxies. 
C)  the universe is collapsing. 
D)  quasars originated in the nucleus of the Milky Way. 
E)  our Sun is at the center of the universe. 
A)  the universe was formed in an explosion that took place between 10 and 15 billion years ago. 
B)  new matter is continuously being created in the space between the galaxies. 
C)  the universe is collapsing. 
D)  quasars originated in the nucleus of the Milky Way. 
E)  our Sun is at the center of the universe.

Question 2

The charge of the particle uss is

Accepted Answer

A)  e 
B)  (1/3)e 
C)  (-2/3)e 
D)  -e 
E)  zero 
A)  e 
B)  (1/3)e 
C)  (-2/3)e 
D)  -e 
E)  zero

Question 3

The property of the universe that primarily determines whether the universe will expand forever or eventually stop its expansion and contract is

Accepted Answer

A)  its average abundance of heavy elements. 
B)  how much of its gas has been converted into stars. 
C)  its average temperature. 
D)  its total mass. 
E)  dependent on the amount of helium in the universe. 
A)  its average abundance of heavy elements. 
B)  how much of its gas has been converted into stars. 
C)  its average temperature. 
D)  its total mass. 
E)  dependent on the amount of helium in the universe.

Question 4

Which of the following statements about antiparticles is true?

Accepted Answer

A)  The charge of an antiparticle is the negative of the particle. 
B)  An antiparticle and particle are always created in pairs. 
C)  The mass of an antiparticle is the same as the particle. 
D)  A neutral particle is its own antiparticle. 
E)  All of these are correct. 
A)  The charge of an antiparticle is the negative of the particle. 
B)  An antiparticle and particle are always created in pairs. 
C)  The mass of an antiparticle is the same as the particle. 
D)  A neutral particle is its own antiparticle. 
E)  All of these are correct.

Question 5

An electron with kinetic energy 589 keV collides with a positron of the same kinetic energy moving in the opposite direction. Calculate the wavelength of the two identical photons produced in the annihilation.

Accepted Answer

A)  4.22 * 10-3 nm 
B)  1.13 * 10-3 nm 
C)  2.11 *10-3 nm 
D)  2.26 * 10-3 nm 
E)  2.26 * 10-3 m 
A)  4.22 * 10-3 nm 
B)  1.13 * 10-3 nm 
C)  2.11 *10-3 nm 
D)  2.26 * 10-3 nm 
E)  2.26 * 10-3 m

Question 6

In the past neutrinos were thought to have zero mass. However, recent observations suggest that they have a small non-zero mass. One such observation is the electron neutrinos from the supernova 1987A which is 168,000 light-years from Earth. The neutrinos were observed within 13 seconds of each other. (Assume the supernova event occurred instantaneously.) This suggests that the difference in speed of the slowest neutrinos to the speed of light, c, is approximately

Accepted Answer

A)  0.13c 
B)  0.87c 
C)  10    
8c 
D)  10    
11c 
E)  10    
16c 
A)  0.13c 
B)  0.87c 
C)  10    
8c 
D)  10    
11c 
E)  10    
16c

Question 7

Mesons are particles that mediate the strong nuclear force. They are thought to travel at near the speed of light and exist over a distance between two nucleons in the nucleus $\backsim$ 1.5 fm. The mass of the mesons is of the order

Accepted Answer

A)  10 MeV/c2. 
B)  150 MeV/c2. 
C)  550 MeV/c2. 
D)  1000 MeV/c2. 
E)  3000 MeV/c2. 
A)  10 MeV/c2. 
B)  150 MeV/c2. 
C)  550 MeV/c2. 
D)  1000 MeV/c2. 
E)  3000 MeV/c2.

Question 8

A particle and its antiparticle must have

Accepted Answer

A)  opposite spins. 
B)  opposite charges. 
C)  opposite masses. 
D)  opposite forces. 
E)  both opposite spins and opposite charges. 
A)  opposite spins. 
B)  opposite charges. 
C)  opposite masses. 
D)  opposite forces. 
E)  both opposite spins and opposite charges.

The scientific community now thinks that

The charge of the particle uss is

The property of the universe that primarily determines whether the universe will expand forever or eventually stop its expansion and contract is

Which of the following statements about antiparticles is true?

An electron with kinetic energy 589 keV collides with a positron of the same kinetic energy moving in the opposite direction. Calculate the wavelength of the two identical photons produced in the annihilation.

Mesons are particles that mediate the strong nuclear force. They are thought to travel at near the speed of light and exist over a distance between two nucleons in the nucleus $\backsim$ 1.5 fm. The mass of the mesons is of the order

A particle and its antiparticle must have

The Electric Field I: Discrete Charge Distributions

The Electric Field II: Continuous Charge Distributions

Electric Potential

Capacitance

Electric Current and Direct-Current Circuits

The Magnetic Field

Sources of the Magnetic Field

Magnetic Induction

Alternating-Current Circuits

Maxwells Equations and Electromagnetic Waves

Properties of Light

Optical Images

Interference and Diffraction

Wave Particle Duality and Quantum Physics

Applications of the Schrodinger Equation

Atoms

Molecules

Solids and the Theory of Conduction

Relativity

Nuclear Physics

Filters

Exam 21: Elementary Particles and the Beginning of the Universe

The scientific community now thinks that

The charge of the particle uss is

The property of the universe that primarily determines whether the universe will expand forever or eventually stop its expansion and contract is

Which of the following statements about antiparticles is true?

An electron with kinetic energy 589 keV collides with a positron of the same kinetic energy moving in the opposite direction. Calculate the wavelength of the two identical photons produced in the annihilation.

Mesons are particles that mediate the strong nuclear force. They are thought to travel at near the speed of light and exist over a distance between two nucleons in the nucleus ∽\backsim∽ 1.5 fm. The mass of the mesons is of the order

A particle and its antiparticle must have

The Electric Field I: Discrete Charge Distributions

The Electric Field II: Continuous Charge Distributions

Electric Potential

Capacitance

Electric Current and Direct-Current Circuits

The Magnetic Field

Sources of the Magnetic Field

Magnetic Induction

Alternating-Current Circuits

Maxwells Equations and Electromagnetic Waves

Properties of Light

Optical Images

Interference and Diffraction

Wave Particle Duality and Quantum Physics

Applications of the Schrodinger Equation

Atoms

Molecules

Solids and the Theory of Conduction

Relativity

Nuclear Physics

Filters

Mesons are particles that mediate the strong nuclear force. They are thought to travel at near the speed of light and exist over a distance between two nucleons in the nucleus $\backsim$ 1.5 fm. The mass of the mesons is of the order