7.The forecast high for today is 7.0 degrees c. How fast is sound moving through the air today? 8. A child is pushed on a swing. With no other inputs, the child moves back and forth for a while and then slowly swings less and less until coming to a rest. This is an example of: a) Damping. b) beat frequency. c) wave transmission. d) standing waves. 9. When springs of different types are joined together, we can study how waves are transmitted through different media. This knowledge is also useful in radio communications systems. True or False? 10. As a sound source approaches you, the wave fronts spread out. True or false? 11. A cable has been cut somewhere between two towns. You hook up a pulse generator and fire a pulse down the line. The pulse returns 75.0s later. If electrical signals travel at 1.50X108m/s in this cable, how far along the cable is the break? 12. An increase of 1 bel, means the sound intensity increased how much