Explore BrainMass
Share

Particle Physics: Nuclear Force, Bohr, Subatomic Particles

This content was STOLEN from BrainMass.com - View the original, and get the already-completed solution here!

1. Considering Yukawa's hypothesis that the nuclear force should be due to the exchange of massive particles (that he called mesons), calculate the expected mass of this hypothetical meson.

2. Draw a table showing all the elementary spins 1/2 anti-particles arranged in three families horizontally with the individual members of each family vertically. In the table give the names, symbols, electric charges and approximate masses of each anti-particle.

3. In a unit system where c=h=1, the Compton wavelength for an muon is given by ___ (see attachment)___ calculate the numerical value. In the same system, the Bohr radius of a muonic hydrogen atom is given by (see attachment) where alpha is the fine structure constant alpha = 1/137, calculate the numerical value. [A muonic hydrogen atom is just equivalent to a regular hydrogen atom but the electron is substituted by a muon].

4. The weak interaction is assumed to be due to W or Z exchange. If the Z has a mass of 90 GeV/c^2, calculate the range of the weak interactions. How does this compare with the size of a nucleon
? What are the consequences for the likelihood of nuclear beta decay.

5. Two protons are separated by a distance of 10^-15m. Calculate (a) the electric force and (b) the gravitational force on one proton due to the other. Using the relative strengths of the strong, electromagnetic, weak and gravitational forces, estimate (c) the strong force and (d) the weak force between the two protons.

Summarize the four results in order of increasing strength.

© BrainMass Inc. brainmass.com October 25, 2018, 10:06 am ad1c9bdddf
https://brainmass.com/physics/relativity/particle-physics-nuclear-force-bohr-subatomic-particles-598225

Attachments

Solution Summary

This solution provides assistance with the questions regarding particle physics.

$2.19
See Also This Related BrainMass Solution

quantum

1. The wavelength spectrum of the radiation energy emitted from a system in thermal equilibrium is observes to have a maximum value which decreases with increasing temperature. Outline briefly the significance of this observation for quantum physics.
2. The “stopping potential” in a photoelectric cell depends only on the frequency v of the incident electromagnetic radiation and not on its intensity. Explain how the assumption that each photoelectron is emitted following the absorption of a single quantum of energy hv is consistent with this observation.
3. Write down the de Broglie equations relating the momentum and energy of free particle to, respectively, the wave number k and angular frequency w of the wave-function which describes the particle.
4. Write down the Heisenberg uncertainty Principle as it applies to the position x and momentum p of a particle moving in one dimension.
5. Estimate the minimum range of the momentum of a quark confined inside a proton size 10 ^ -15 m.
6. Explain briefly how the concept of wave-particle duality and the introduction of a wave packet for a particle satisfies the Uncertainty Principle.

View Full Posting Details