Q. Two sound sources radiating in phase at a fre- quency of 540 Hz interfere such that maxima are heard at angles of 0? and 21? from a line perpendicular to that joining the two sources. Find the separation between the two sources. The velocity of sound is 340 m/s. Answer in units of m.
Q. A communications satellite is in an orbit that is 3.10 107 m directly above the equator. Consider the moment when the satellite is located midway between Quito, Equador, and Belem, Brazil; two cities almost on the equator that are separated by a distance of 3.60 x10^6 m. Find the time it takes for a telephone call to go by the way of satellite between these cities. Ignore the curvature of the earth.