You see your friend 120 m away down the street. If you yell back and forth, your

Question

You see your friend 120 m away down the street. If you yell back and forth, your conversation will be affected by the speed of sound, which is 340 m/s. If, instead, you use your cell phone to call her on her cell phone, the conversation is relayed via a communications satellite that is 36000 km above you. (a) What is the delay between a sound leaving your mouth and its arrival at your friend's ear if you yell? (b) What is the delay between a sound leaving your mouth and its arrival at your friend's ear if you use your cell phone? (c) How far would you have to be from your friend for the delays to be equal?

Explanation / Answer

(A) t = 120 / 340 = 0.353 sec

(B) t = 2(36000 x 10^3) / (3 x 10^8)

t = 0.240 sec

(c) then d / 340 = 0.240

d = 81.6 m

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