(a) Suppose Betty takes off in one direction while Andy travels at the same speed but in the opposite direction. They travel an equal distance from Earth, then turn around and come back. What will Andy's, Betty's, and the Earth's clocks show? (b) If two of triplets travel in opposite directions for 5 light years and then return: (i) will they be the same age? (ii)How will their age be, compared to the triplet who stayed home?

Sally turns on her cellular telephone to speak to her friend who is located thousands of miles away. which of the following best describes how such a telephone is able to transmit and receive information? a. the cellular telephone transmits, receives, and encodes information using only sound waves. b. the cellular telephone transmits, receives, and encodes information using only electromagnetic waves. c. the cellular telephone transmits information by electromagnetic waves to a receiver which then encodes them and produces sound. d. the cellular telephone transmits information by sound waves to a receiver which then encodes them and produces electromagnetic waves.