Diffraction Grating

1) If a diffraction grating has 6,000 grooves per centimeter, to what angle will the first order constructive interference "line" of the Hydrogen Alpha (red) emission be diffracted? 2) Atoms of the hydrogen gas enveloping a particular star absorb the Hydrogen Alpha wavelength from the white light emanating from the surface o ...continues

Nuclear physics

1. An alpha particle is fired at a sheet of gold with a kinetic energy of 4.62E-13 joules. Knowing that each gold nucleus has 79 protons, about how close will the alphas come to the nucleus? 2. If the binding-energy-per-nucleon for an alpha particle is 61.0 MeV, what is the total binding energy of the alpha? Give you answer ...continues

Determining the final mass of a cup using calorimetry.

A 150 gram Aluminum calorimeter cup contains 320 grams of water at 22 degrees Celsius. Steam at 100 degrees Celsius is routed into the calorimeter until the temperature of the cup and its contents reaches 50 degrees Celsius. What is the final total mass of the cup and its contents?

Like charges on two identical balls

Two identical metal balls bear the same amount and sign of electric charge because they have been touched together. The mass of each ball is 2.00 grams. One ball is mounted on an insulating post. The other ball is suspended from a bifilar silk thread suspension system so that it can move on a 0.500 meter radius. When the two ...continues

The potential difference across a cell.

The electrical resistance of a particular electrolytic cell is 5.00 Ohms. A potential difference of 50.0 volts is applied across the cell. If the cell is a copper cell, how much time will be required for 63.54 grams of copper to be deposited on the negative electrode? (Assume the valence of copper is +2).

Using Wein's Law and Planck's quantum equation.

1) The temperature of the surface of the Sun is 5800 K. Using Wein's Law, compute the wavelength of the color of light at which the Sun has its greatest Emissive Power. Describe this color verbally. 2) Use Planck's quantum equation to compute the energy of the "photons" of the light for the color whose wavelength was identi ...continues

Calculating the radius of an electron in a magnetic field. Cathode/potential difference

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 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 mas ...continues

time dilation

Two observers agree to test time diliation. They use identical clocks, and one observer in frame s' moves with speed v=0.6c relative to the other observer in s. When their origins coincide, they start thier clocks. They agree to send a signal when their clocks read 60 minutes and to send a confirmation signal when each receiv ...continues

Object/Image relationships

An object is placed 15.0 cm from mirror whose focal length is 5.0 cm. The object is 6.0 cm high: what is the size of the image?

Calculating the time it takes for two runners at different speeds to cross each other.

It's a sunny Sunday afternoon, about 17 degrees and you are walking around a lake enjoying the early signs of spring. The sidewalk is crowded with runners and walkers. You notice a runner approaching you wearing a t-shirt with writing on it. You read the first two lines, but are unable to read the third and final line before he ...continues