Speed and Doppler effect

1 / 8

# Speed and Doppler effect - PowerPoint PPT Presentation

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.

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

## PowerPoint Slideshow about 'Speed and Doppler effect' - fell

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

### 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
• 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
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.
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
Q5
• Find the wavelength in air of 20⁰C of an 18 Hz sound wave.
Q6
• If you shout across a canyon and hear the echo 0.80 s later, how wide is the canyon?
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.