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