A dolphin located in seawater at a temperature of 25°C emits a sound directed toward the bottom of the ocean 140 m below. How much time passes before it hears an echo?
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2007-12-09 12:05:33 · 1 answers · asked by Ashley S 1 in Science & Mathematics ➔ Physics
Depends on a lot of things you've not given. What's the salinity and pressure gradient between the dolphin and sea bottom? These, too, enter into the speed of sound in water equation.
Assuming the dolphin is stationary while its ping travels to the sea bottom and back, the distance traveled is D = 2d = vt; where v is the speed of sound, t is the time you're looking for, d = 140 m (the depth), and D is the distance the emitted sound travels and echos back to the dolphin. Find the speed of sound for the conditions of the water and the answer is straightforward.
2007-12-09 12:20:06 · answer #1 · answered by oldprof 7 · 0⤊ 0⤋