1. IOne goes up the other goes up.

2. Frequency (ƒ) – number of wave cycles that pass in a point of given time 1/period How often something happens. Your heart rate is a frequency, measured as beats (cycles) per minute (time).

3. Hertz (Hz) Unit for Frequency is Hertz (Hz) – cycles per second

4. Hertz (Hz) – cycles per second/ how you measure frequency And this is one second If this is one wave What is each wave’s frequency? 1 1 2 123 3.5

5. 1 year 3 months 6 months 9 months Period (T) – time required for one cycle – Or a complete motion that returns to its starting point How long is a class Period? The motion of the earth around the sun has a period of one year.

6. Velocity

7. Math Equations

8. Velocity of Waves Math Trick ÷ X

9. Wavelength of Waves Math Trick ÷ X PERIOD T

10. Finish: Math Practice – Speed and velocity used interchangeably—right now they mean the same thing – Stay in your seats until you are done – When you finish form a group of three, get a stamp and a slinky

11. Exit Question An earthquake has a speed of 4000 m/s and a frequency of 8 Hz. What is its wavelength? Wavelength = 500m