10/30/08

Post date: Oct 29, 2008 5:9:3 PM

Bell Activity: Imagine you are floating on a boat near a dock. You have a stopwatch and a meter stick with you. How would you calculate the speed of the waves as they go by you?

• • Finish Page 519: 1-3 and turn in.

  • Complete part 4 of yesterday's lab

    • Create another standing wave, this time with a different number of loops than the one you used yesterday. Do this by increasing your decreasing your frequency.

    • Make the same measurements as you did before with your new wave, and use these to find your new wave speed. How does it compare with the first wave speed you found?

    • What factors do you think affect the speed of a wave?

• Wave speed depends on medium

  • Sound moves faster in warm air than cool air

  • Sound moves faster in water than air

  • Speed of light - 300,000,000 m/s in a vaccuum.

  • The Doppler Effect

    • Frequency changes when the object making a wave is moving

    • Example

      • Sound waves

        • chime moving forward and backward

        • plastic tubes

      • Light waves

        • red shift

• Section 2 Review Due Monday