1. Key Ideas
I will be able to describe the relationship between the frequency and wavelength of a wave.
I will understand why waves travel at different speeds.

2. Vocab Words
Amplitude
Wavelength
Frequency

3. Page 9 What are the amplitudes (in meters) of the waves below?
Amplitude – A measure of how high crests are; the greater the amplitude, the more energy a wave carries.
.75 m
1 m

4. Wavelength – Distance from the top of one crest to the top of the next crest, or from the bottom of one trough to the bottom of the next trough.

5. Smaller wavelengths result in higher frequencies.
1)Frequency is measured in Hertz
2) Speed divided by distance.
3) Frequency related to the wavelength
Smaller wavelengths result in higher frequencies.
Larger wavelength result in shorter frequency.
Frequency – Number of wavelengths passing a given point per second. Measured in hertz.
- In other words, how many waves there are.

6. This wave has a high/low frequency

7. Wave Period Wave period is just how much time it takes
for one cycle to pass and the units are
always in term of time. The faster
a wave moves its period becomes smaller

8. Color and pitch result from the wavelengths and frequencies of light and sound.
Red
Orange
Yellow
Green
Blue
Indigo
Violet

9. Speed = Wavelength • Frequency
Wave Speed – how fast a wave travels through a medium.
Mechanical waves travel faster in a medium in which atoms are packed closer together.
Electromagnetic waves travel faster in a medium with fewer atoms in it.
Speed = Wavelength • Frequency
Wavelength = Speed / Frequency
Frequency = Speed / Wavelength

10. Labeled Waves

11. Whiteboard Time
1) Find the speed of a wave with a wavelength of 5m and a frequency of 68 Hz.
2)Find the wavelength of a soundwave traveling in water with a speed of 1,470 m/s and a frequency of 2,340 Hz.
3) If Mr. Kelly does a cannonball and generates a wave that a wavelength of3.2m and a frequency of0.60 Hz, how fast is the wave moving?
4) An earthquake wave travels at 5000m/sec and has a wavelength of 417 m. What is its frequency?