1. Properties of Waves
EQ: How do I describe the basic properties of waves? How is a wave’s speed related to its wavelength and frequency?

2. Vocabulary Crest - The highest point, or peak, of a wave.
Trough -The lowest point, or valley, of a wave.
EQ: How do I describe the basic properties of waves? How is a wave’s speed related to its wavelength and frequency?

3. Properties of Waves There are four wave properties Amplitude
Wavelength
Frequency
Speed
EQ: How do I describe the basic properties of waves? How is a wave’s speed related to its wavelength and frequency?

4. EQ: How do I describe the basic properties of waves
EQ: How do I describe the basic properties of waves? How is a wave’s speed related to its wavelength and frequency?
water level
at rest
fixed point
crest
trough
Wavelength is the distance from one
crest or trough to the next.
Amplitude is
the distance a
medium moves
above or below its
position at rest.
Frequency is the number of wavelengths passing a fixed point in a certain amount of time, usually 1 second.

5. Means trough in a transverse wave
Means crest in a transverse wave
EQ: How do I describe the basic properties of waves? How is a wave’s speed related to its wavelength and frequency?

6. Amplitude
The maximum distance that a disturbance causes a medium to move from its rest position; the distance between a crest or trough of a wave and line through the center of a wave.
Rope example: move your hand up and down at a greater distance, increases the amplitude. Uses more energy.
Slinky – high vibrations cause the compressions to be more crowded and rarefactions loose giving the slinky higher amplitude.
EQ: How do I describe the basic properties of waves? How is a wave’s speed related to its wavelength and frequency?

7. Which wave has a greater amplitude?

8. Which longitudinal wave has the larger amplitude?
crowded
Not very crowded
EQ: How do I describe the basic properties of waves? How is a wave’s speed related to its wavelength and frequency?

9. Wavelength The distance between two corresponding parts of a wave
EQ: How do I describe the basic properties of waves? How is a wave’s speed related to its wavelength and frequency?
Wavelength
The distance between two corresponding parts of a wave

10. EQ: How do I describe the basic properties of waves
EQ: How do I describe the basic properties of waves? How is a wave’s speed related to its wavelength and frequency?
Frequency
The number of complete waves that pass a given point in a certain amount of time or the number of vibrations per second.
Hertz (Hz) – measures frequency. A wave that occurs every second has a measurement of 1 Hz. If two waves pass you every second then the measurement is 2 Hz
Example – if you move your hand slower, decreases frequency, move it faster increases frequency.

11. Speed Waves in different mediums travel at different speeds
Ex. Light and sound- see a flash of lighting, hear a clap of thunder
Speed, wavelength and frequency related to each other by the formula
Speed = wavelength x frequency
EQ: How do I describe the basic properties of waves? How is a wave’s speed related to its wavelength and frequency?

12. Go Figure
The speed of a wave on a rope is 50 cm/s and its wavelength is 10 cm. What is the frequency?
The speed of a wave on a guitar string is
100m/s and the frequency is 1000 Hz. What is the wavelength of the wave?
EQ: How do I describe the basic properties of waves? How is a wave’s speed related to its wavelength and frequency?

13. Class Work Homework Fill in
What did I learn
Confused
Say
Read pages O 18 – O 23
Worksheet
EQ: How do I describe the basic properties of waves? How is a wave’s speed related to its wavelength and frequency?