Physics Commons^™

Physics 3710 – Problem Set #4, David Peak

Problems

Physics 3710 – Problem Set #4 Relativistic kinematics, II

Physics 3710 – Problem Set #11, David Peak

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Physics 3710 – Problem Set #11 QED Feynman diagrams

The solid arrows are electrons or positrons, the wavy lines are photons. Describe the “in” and “out” states shown below and describe what happens at each vertex. What is an overall name for each of the diagrams shown? (e.g., “electron-photon scattering”)

Physics 3710 – Problem Set #6, David Peak

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Physics 3710 – Problem Set #6 Relativistic dynamics, II

Problems 1-5 refer to: The mass of the neutron is 1.008664 u and that of the proton is 1.007276 u, where 1 u = 931.5 MeV.

Physics 3710 – Problem Set #9, David Peak

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Physics 3710 – Problem Set #9 Relativistic gravity, II

Physics 3710 – Problem Set #3, David Peak

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Physics 3710 – Problem Set #3 Relativistic kinematics, I

Physics 3710 – Problem Set #5, David Peak

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Physics 3710 – Problem Set #5 Relativistic dynamics, I

Problems 1-5 refer to: One mass, m₁ = 1 (in some units), collides head-on with a second mass, m₂ = 2 , and sticks to it, forming a composite body of mass M . There are no external forces. Observer O records m₁ as initially moving with dimensionless velocity, u1 = +0.9 in the x - direction, while m₂ is recorded to be at rest. Do not make unwarranted assumptions about M , please; that’s the point of this set of problems.

Physics 3710 – Problem Set #7, David Peak

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Physics 3710 – Problem Set #7 Newtonian gravity

Physics 3710 – Problem Set #8, David Peak

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Physics 3710 – Problem Set #8 Relativistic gravity, I

Physics 3710 – Problem Set #2, David Peak

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Physics 3710 – Problem Set #2 Newtonian relativity

Problems 1-4 refer to: Sound travels at about 330 m/s in still air. Observer O is at rest with respect to still air, observer O′ travels with constant velocity +50 m/s in the common x, x′ direction. Event A is the emission of a sound pulse from a stationary source at the origin of O; it occurs at x_A = 0 at t_A = 0. Event B is the reflection of the pulse at x_B = +100 m. Event C is the detection of the reflected pulse at x …

Physics 3710 – Problem Set #10, David Peak

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Physics 3710 – Problem Set #10 Relativistic gravity, III

Problems 1-3 refer to: The maximum measured z value for a galaxy is 11.1. As on page 1, GR7, z = λ_d − λ_e / λ_e.

Physics 3710 – Problem Set #12, David Peak

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Problem Set #12 Quarks and gluons

In the following solid lines represent quarks or antiquarks and dotted lines represent gluons. Time increases upward.

Physics 3710 – Problem Set #13, David Peak

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Physics 3710 – Problem Set #13 Some weak interaction stuff

Questions 1-4 refer to the diagram at the right. In it, a particle p₁ absorbs a particle X and transforms into a particle p₂. Time increases vertically.

Problem Set #8, David Peak

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A bit of stat mech

Problems 1-3 refer to: N identical, noninteracting, and distinguishable spin-1/2 particles (i.e., their separation is much greater than their de Broglie wavelength) are placed in an external magnetic field. Assume the ground state energy of one such particle is 0 and the excited state energy is ε , and the system is in thermal equilibrium at temperature T.

Problem Set #1, David Peak

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A little E&M practice

Problems 1-2 refer to: The electric field in a laser beam is given by E( x,t) = (1000V/m)sin[(πx10⁷rad/m) x + (3πx10¹⁵rad/s)t].

Problem Set #2, David Peak

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A little energy and momentum practice (and units)

Problems 1-2 deal with “rest” energy and relativity.

Problem Set #5, David Peak

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Expectations & 1D finite wells

Problem Set #3, David Peak

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Comparing classical electromagnetic waves with photon probability waves.

Problem 1 refers to: A standing electric field wave (one with lots of photons) in a quantum wire stretching between x = 0 and x = L is described by E(x,t)=E_maxsin(3πx/L)cos(3πct/L). Let L = 900 nm.

Problem Set #4, David Peak

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Some 1D infinite well stuff

Problem Set #6, David Peak

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3D, 1-particle systems

Problem Set #7, David Peak

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Atom stuff

Problem Set #9, David Peak

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Another bit of stat mech

Problems 1-3 refer to: N identical, noninteracting, and distinguishable quantum harmonic oscillators (i.e., their separation is much greater than their de Broglie wavelength) are in thermal equilibrium at temperature T. The energy of each oscillator can be expressed as ε_n = nε , where ε is the level spacing and n = 0, 1, 2, … .

Problem Set #10, David Peak

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Blackbody

Problem Set #12, David Peak

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Solid stuff