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 the mass and charge of the electron, compute the radius of the circular path upon which the electrons will move while in the magnetic field. (Assume the electron beam enters the magnetic field at 90 degrees to the flux density.)

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.