# physics

a ship sends a snoar pulse of frequency 30kHz and duration 1.0 ms towards a submarine and receives a reflection of the pulse 3.2 s later. the speed of sound in water is 1500 ms-1. find the distance of the submarine from the wavelength of the pulse and the number of full waves emitted in the pulse.

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1. 2 * distance = V * t

no. of waves = frequency * (pulse duration)

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posted by drwls
2. i still don't get it. why is the distance x 2 and what does it mean ms for the pulse duration

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posted by sake
3. because that distance includes there and back from the sub to the ship. so to only get the distance you have to divide by two. and ms means milli seconds so it is 0.001 seconds

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posted by finn

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