14. one point, from Lectures 13 and 14, calculation

(a) .3 from Lecture 13, Hear That Bang! What is the speed of sound in air c_sound? (.1)
How long would it take sound from an explosion on campus to reach a mall about 8.5 kilometers away? (Numbers easy.) (.2)

b) .3 from Lecture 14, See That Bang! What is the speed of light in vacuum c? (.1)
How long would it take light from the explosion to reach the mall? (Numbers not as easy.) (.2)

(c) .4 from Lecture 14, Tune In. Use c=lambda times f to find the wavelength of your favorite FM station. Use c from part (b) (I assume you'll have it right), and be aware that the FM call number is in units of megahertz=10^6 hertz=MH. Thus 100 on the FM dial is 100X10^6 H=10^8 H. (Numbers unlikely to be easy.) If your favorite station isn't in Madison, say where it is. (.4)

Revised September 25, 1997.