Ch. 10 Homework Exercises

1. If you move your finger at a steady rate up and down into a puddle of water to make waves, what happens to the wavelength when you move your finger faster (more frequently)?

2. A dog can hear sound at frequencies up to 45,000 Hz and a cat can hear sound at frequencies up to 70,000 Hz. Which animal hears sounds to shorter wavelengths, cats or dogs?

3. A friend of yours tells you that wave frequency and wave speed are the same thing. What do you tell them?

4. If you have a slinky (coiled spring) and want to make a transverse wave, how do you move it?

5. If you have a slinky and want to make a longitudinal wave, how do you move it?

6. If you are in a space station, and nearby a rocket blows up, what sound would it make? Why?

7. How can an electric guitar make a certain sound to shatter a crystal glass?

8. John says that sound travels slower in cold air than in warm air. Do you agree? Why?

9. What is the speed of sound on a beach at 40 ^oC?

10. A piano string vibrates in a standing-wave pattern, as shown. What is the wavelength of the wave?

120 cm