1 / 10

Properties of Sound Waves

Properties of Sound Waves. MHR 8.2. The Speed of Sound. The speed of sound through air depends on the density of air and the temperature v= 331 +0.59 T air Where v= speed of sound in air measured in m/s The constant 0.59 accounts for the density of air T air is the temperature in 0 C

jeffd
Download Presentation

Properties of Sound Waves

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Properties of Sound Waves MHR 8.2

  2. The Speed of Sound • The speed of sound through air depends on the density of air and the temperature • v= 331 +0.59 Tair • Where v= speed of sound in air measured in m/s • The constant 0.59 accounts for the density of air • Tair is the temperature in 0C • Please note, the units work out to m/s – read MHR pg. 378

  3. Problem #1: the speed of sound • Today, the temperature outside is 4 0C. What is the speed of sound in air? • Answer: • v= 333.36 m/s

  4. Problem #2: Find Temperature • If the speed of sound is measured to be 318 m/s, what is the air temperature? • Answer: • -22.1 0C

  5. Problem #3: Echo • Going back to question #1, if you were hiking in a canyon and shouted, you may hear an echo. • Lets assume you hear the echo 2.8s later. • How far would the canyon wall be? • Answer: • Δ d =466.7 m

  6. Mach Number • Mach number: the ratio of the airspeed of an object to the local speed of sound • M = air speed of object/ local speed of sound

  7. Problem #4: Mach number • An aircraft is flying 905 km/h in air at a temperature of – 50.0 0C. Calculate the Mach number. • M = 0.835 • So what does 0.835 mean???

  8. Mach Number: some facts • As an air craft approaches the speed of sound, it catches up to the sound waves. • These waves build up to form a shock wave- also known as the sound barrier at Mach one • The shock wave can cause severe damage to the plane and pilot • Chuck Yeager was the first pilot to break the sound barrier in 1947

  9. Image of plane breaking sound barrier

  10. Your Turn • MHR pg. 382 # 1-6 • MHR pg. 422 # 1,2

More Related