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A fish finder uses a sonar device that sends $20,000$ -Hz sound pulses downward from the bottom of the boat, and then detects echoes. If the maximum depth for which it is designed to work is $75 \mathrm{m},$ what is the minimum time between pulses (in fresh water)?
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Physics 101 Mechanics
Chapter 16
Sound
Periodic Motion
Mechanical Waves
Sound and Hearing
Cornell University
University of Washington
University of Winnipeg
McMaster University
Lectures
08:15
In physics, sound is a vibration that typically propagates as an audible wave of pressure, through a transmission medium such as a gas, liquid or solid. In human physiology and psychology, sound is the reception of such waves and their perception by the brain. Humans can only hear sound waves as distinct pitches when the frequency lies between about 20 Hz and 20 kHz. Sound above 20 kHz is known as ultrasound and has different physical properties from sound below 20 kHz. Sound waves below 20 Hz are called infrasound. Different species have different hearing ranges. In terms of frequency, the range of ultrasound, infrasound and other upper limits is called the ultrasound.
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In physics, a traveling wave is a wave that propogates without a constant shape, but rather one that changes shape as it moves. In other words, its shape changes as a function of time.
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fish finder uses a sonar device that sends a 20,000 hurt sound polls downward from the bottom of the boat and then detects echoes if the maximum death for which it is designed to work A 75 meters. What is the minimum time between pulses and the fresh water? Okay, so I would know what we were given here. We're told that the frequency is 20,000. The depth the maximum death at which it can go is 75 meters and the speed of sound in freshwater visa messes 1440 meters per second. Okay, so the total distance, the wave that travels test to go the depth and then back up would be too. So we'll call this total distance Decent teak for total. It's going to be two times the death. Okay, which is equal to 150 meters. Okay, well then define the time between pulses. The total time between pulses, Then it would be the velocity. Anyways, distance something travels right is equal. Have lost three times time. Simple equation. We know that one. What's a V? The velocity of sound times The time it takes right so we want the time, so we just simply solve For the time this will be equal to total distance divided by the velocity of this out. So 100 50 meters divided by 1440 meters per second. We'll get you a total of 0.1 seconds. So be zero using the correct number of significant figures your 0.10 seconds oxidant their solution.
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