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Speed and Doppler effect. Questions. Q1. You are in an auto traveling at 25.0 m/s towards a pole mounted warning siren. If the siren’s frequency is 365 Hz, what frequency do you hear? The temp of air is 20⁰C. Q2.

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Presentation Transcript
slide2
Q1
  • You are in an auto traveling at 25.0 m/s towards a pole mounted warning siren. If the siren’s frequency is 365 Hz, what frequency do you hear? The temp of air is 20⁰C
slide3
Q2
  • You are in a car traveling 24.6 m/s. A second car is moving towards you at the same speed. Its horn is sounding at 475 Hz. What frequency do you hear? Use 15⁰C as the te3mperature of air
slide4
Q3
  • A submarine is moving towards another sub at 9.2 m/s. It emits a 3.5 MHz ultrasound. (1 MegaHz = 1,000,000 Hz)
  • What frequency would the second sub, at rest, detect? The speed of sound in water is 1482.
slide5
Q4
  • A sound source plays middle C (262 Hz). How Fast would a source have to go to raise the pitch to C sharp (271 Hz)? The detector remains stationary. Use 25⁰C as temperature of air
slide6
Q5
  • Find the wavelength in air of 20⁰C of an 18 Hz sound wave.
slide7
Q6
  • If you shout across a canyon and hear the echo 0.80 s later, how wide is the canyon?
slide8
Q7
  • A 2280 Hz sound wave has a wavelength of 0.655 m in an unknown medium. Based on its speed, predict the type of medium it is passing through.