1. Explain how medical magnetic resonance imaging (MRI) exploits the magnetic properties of the nucleus. How are the images used for medical diagnosis?
2. Explain how a sound is actually a form of energy? In what medium do sound waves travel? What is the wavelength of the carrier wave used by your favorite radio station?
3. A current is connected to 115-volt power source. If a current of 5 amps flows in the wire, what is the resistance of the circuit?
4. In what ways do different kinds of seismic waves differ from waves on water? Identify at least THREE everyday examples of waves that travel through each of the following: