Exam 28: Particle Physics

An alternate statement of the uncertainty principle involves relationship between position $\Delta$ x) and momentum $\Delta$ p) uncertainties in the form . The graph shows the uncertainty in measuring the position x and momentum p of a particle in four experiments. Region 1 has area h, region 2 has area 4h, region 3 has area 2h, and region 4 has area 3h. The region that correctly represents the uncertainty principle is

You want to make simultaneous measurements of the position and momentum of an electron and a proton that are moving along a straight line. An alternate statement of the uncertainty principle involves relationship between position $\Delta$ x) and momentum $\Delta$ p) uncertainties in the form . If both of them are located with an uncertainty of 1 × 10^-10m, what is the ratio of uncertainty in the velocity of the electron to that of the proton?

Redshift measurements of a galaxy yield a recession speed of 1000 km/s. Hubble's constant H is 23-km/s/10⁶ ly. The distance to the galaxy is approximately

The numbers L = -1 and B = +1 describe

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 of $\backsim$ 1.5 fm between two nucleons in the nucleus. The mass of the mesons is of the order

The numbers L = 0 and B = 0 describe

Hubble's Law relates the speed of a galaxy from its distance to us. If you assume Hubble's constant to be 23 km/s/10⁶ ly, then what is the distance of a galaxy that is traveling at 10% the speed of light away from us?

The charge of the particle is

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

An alternate statement of the uncertainty principle involves relationship between position $\Delta$ x) and momentum $\Delta$ p) uncertainties in the form . A proton rest energy = 938 MeV) is confined in a space of length 3.0 *10^-15 m, about the size of a lightweight nucleus. The minimum uncertainty in its momentum is approximately

Which of the following combination of quarks has either zero or integral electronic charge? 1) 2) 3) 4) 5) 6)

What is baryon number and electric charge in units of e) for the three-quark combination uuu?

Which of the following combination of quarks has either zero or integral electronic charge? 1) 2) 3) 4) 5) 6)

Molecular forces and most of the everyday forces we observe among macroscopic objects are best understood in terms of

An alternate statement of the uncertainty principle involves relationship between position $\Delta$ x) and momentum $\Delta$ p) uncertainties in the form . An electron has a kinetic energy of 1.5 eV. If its momentum is uncertain by ± 2.5%, the minimum uncertainty in its position is approximately

The field quanta that mediate the weak nuclear force are

The numbers L = +1 and B = +1 describe

The uncertainty principle states that

Particles that participate in the weak interaction but not the strong interaction are called

You want to make simultaneous measurements of the position and velocity of an electron that is moving in the positive-x direction. An alternate statement of the uncertainty principle involves relationship between position $\Delta$ x) and momentum $\Delta$ p) uncertainties in the form . If the velocity is measured to an accuracy of 10^-7 m/s, the limit of accuracy with which you can locate the electron is approximately