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SCAN0016

# SCAN0016 - 6 Standing on the‘ sidewalk next to your...

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Unformatted text preview: 6. Standing on the‘ sidewalk next to your parked car you hear the siren of an approaching fire engine. The transmitted frequency of the approaching fire engine is 1200 Hz but you hear a frequency of 1363 HZ. It is a very hot day with the air temperature at 100°F. a. (5 points) What is the velocity of sound in air? b. (5 points) What is the speed of the approaching fire engine in km/h? 3. V: gsimfs 'U T/z'rﬁiﬁ 7. A speaker is mounted on a vertical pole at the same height as your ear. A second speaker is mounted on the same pole, 3.0 m above the first speaker. These speakers transmit in phase a sound wave of frequency 460 Hz. Assume the speed of sound in % air is 345 Hz. ‘ a. (5 points) Describe the interference you hear standing near the pole. { b. (5 points) As you walk from the pole to a point that is 4.0 m from the base of the ’Q pole, how many constructive ' terference maximums and how many destructive ...
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