An ultrasound detector emits and pulse and hears'' an echo 2 ms (0.002 s) later off a wall 34.5 cm away. What is the temperature in the room, in Celsius?

College Physics
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ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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An ultrasound detector emits and pulse and hears'' an echo 2 ms (0.002 s) later off a wall 34.5 cm away. What is the temperature in the room, in Celsius?

 

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Step 1

An ultrasound detector emits pulses of sounds at high frequencies, and then detects the echoes of these pulses at later intervals.

In the given problem, an ultrasound detector emits a pulse, and hears an echo after a time of 2 ms or 0.002 s.

This echo heard comes from a wall, which is 34.5 cm away from the detector. Thus, the total distance the sound pulse travels from and back to the detector, is 34.5×2=69 cm=0.69 m

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