1.Explain how medical magnetic resonance imaging (MRI) exploits the magnetic properties of the nucleus. 2.Explain how a sound is actually a form of energy? In what medium do sound waves travel? 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.Find out where your electrical power is generated. Does your local utility buy additional power from some other source? What kind of fuel or energy is used to drive the turbines? Are there pollution controls that restrict the use of certain kinds of fuels at your local power plant? 5.Identify at least THREE everyday examples of waves that travel through each of the following: ◦solids ◦liquids ◦gases 6.In what ways do different kinds of seismic waves differ from waves on water? 7.Why are the X-rays used for medical diagnosis? 8.What other wavelengths of electromagnetic radiation are used in medicine? 9.What is the wavelength of the carrier wave used by your favorite radio station?