1. Like most dolphins, "Sparky the Wonder Dolphin" uses echolocation (or sonar) by emitting high frequency "clicks" to locate objects in the water around her. Typical frequency of a dolphin's sonar click is 100 kHz, while the typical intensity of a sonar click at a distance of 1 m from a dolphin's head is 200 dB. The speed of sound in sea water is about 1520 m/s. If Sparky emits a sonar click that bounces off a school of tuna 20 km distant, a) how long must she wait to hear the reflected pulse, and b) what is the intensity in dB of the reflected pulse that she hears?

1. Like most dolphins, "Sparky the Wonder Dolphin" uses echolocation (or sonar) by emitting high frequency "clicks" to locate objects in the water around her. Typical frequency of a dolphin's sonar click is 100 kHz, while the typical intensity of a sonar click at a distance of 1 m from a dolphin's head is 200 dB. The speed of sound in sea water is about 1520 m/s. If Sparky emits a sonar click that bounces off a school of tuna 20 km distant, a) how long must she wait to hear the reflected pulse, and b) what is the intensity in dB of the reflected pulse that she hears?

College Physics

11th Edition

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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