Full Question:
A dolphin located in sea water at a temperature of 21 degrees Celsius emits a sound directed toward the bottom of the ocean 158 m below. How much time passes before it hears an echo? Assume the the speed of sound in sea water is 1530 m/s at this temperature. Answer in units of s (seconds).
A dolphin located in sea water at a temperature of 21 degrees Celsius emits a sound directed toward the bottom of the ocean 158 m below. How much time passes before it hears an echo? Assume the the speed of sound in sea water is 1530 m/s at this temperature. Answer in units of s (seconds).
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Well to find the time the sound hits the floor, you would have to multiply:
158m x (1s/1530m)
however, this is an echo problem, which means that the sound has to hit the floor of the sea and then back up towards the dolphin, and assuming the dolphin hasn't moved from when it emitted a sound, you would just multiply the answer from the first calculation by 2.
so the whole calculation is this 2((158)(1/1530)), which is 0.207 seconds with correct
significant figures.
158m x (1s/1530m)
however, this is an echo problem, which means that the sound has to hit the floor of the sea and then back up towards the dolphin, and assuming the dolphin hasn't moved from when it emitted a sound, you would just multiply the answer from the first calculation by 2.
so the whole calculation is this 2((158)(1/1530)), which is 0.207 seconds with correct
significant figures.