Determining an equation that relates photon energy to wavelength.

Using the equation for photon energy, and the equation relating wavelength to frequency, figure out an equation that relates photon energy to wavelength.

Calculating the raduis of a circular path in regards to Helmholtz coils.

Electrons from a hot cathode move ("fall") through a potential difference of 100.0 volts and then enter the uniform magnetic field between the coils of a Helmholtz set. The coils have a radius and separation of 0.150 meters. Each coil has 200 turns. The current through the coils is 0.500 Amperes. Using published values for t ...continues

The resistance of paper.

What is the resistance of paper?

Comparing the maximum voltage to the average voltage in AC circuits.

What is the comparison between the maximum voltage (or current) and the average voltage (or current)?

Waves

For a hollow tube length l opened at one end and closed at the other: a)Draw the first 3 resonant sound waves, starting with the lowest frequency b)Indicate the wavelength for each wave c) explain the boundary conditions at the ends in terms of the displacement and pressure aspects of the sound wave.

A droppler question: Calculating the frequency of sound waves.

An untethered(free) weather balloon travelling with the wind (at wind speed) emits a 1 khz sound wave. The wind is blowing with respect to the land due east at .25 times the speed of sound in air. If the free balloon is moving away (due east)from a tower at same height, what is the frequency of the sound detected at the tower? ...continues

Calculating electic potential charges on point particles.

Two point particles, each with charge Q, are placed at positions +- a x. A) What is the elctric potential anywhere along the y axis? B) How much energy does it take to move a thrid particle, charge Q, from infinity to a position in order to make an equilateral triangle among the charges? (ie. all edges have length 2a)

charge density...electric field...electric potential

A (infinitley long) cylindrical non-conducting tube, inner radius a and outer radius b, with charge density p0 sits in a vacuum. Find (show work and derive) and sketch a plot as a function of radius r: A) the charge density B) the total charge enclosed in a cylindrical gaussian surface of radius r C) the electric fie ...continues

capacitar....

consider a parallel plate capacitor with surface area A and spacing d between plates: A) express the electric field in terms of the capacitance C, the charge Q, and A and d. recall the capacitance is C=E0*A/d. B) derive the energy stored in the capacitor Uc, when it has a charge Q on it. Do this by connecting a resistor a ...continues

current density, magnetic field

A long conducting circular cylindrical tube(circular cylinder inner radius a outer radius b) carries a total axial current Io distributed through the conductor. Find and sketch a plot as a function of radius (show work) A) the current density J(r) B) The magentic field B(r)