You see your friend 100 m away down the street. If you yell back and forth, your

Question

You see your friend 100 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?
s

(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?
s

(c) How far would you have to be from your friend for the delays to be equal?
m

Explanation / Answer

Part A

100=340*t

t=0.2941s

Part B(consider speed of light)

36 * 10^6 * 2 = 3 *10^8 *t

t = 0.24 seasonds

Part C

speed * time = 340 * 0.24 = 81.6 m away

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