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# OL PH 223 20:5-7

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## Richard Datwyler

on 21 January 2016

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#### Transcript of OL PH 223 20:5-7

Traveling waves part 2
Example

A loudspeaker on a tall pole emits sound in all directions, What is the speaker's power output if the sound intensity level is 90dB at a distance of 20 m?
Your turn, how far would you need to be away to have an intensity of 70 dB?
A physics professor demonstrates the doppler effect by tying a 600 Hz sound generator to a 1.0 m long rope and spins it over her head at a speed of 100 rpm. What are the highest and lowest frequency heard by a student in the room?
r = 200 m
582 Hz - 619 Hz
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