1. Wave Properties
Chapter 10.2

2. Parts of a Wave Transverse waves Compressional Waves
Crest- highest point of the wave
Trough- lowest point
Compressional Waves
Compressions: regions where waves are crowded close together
Rarefaction: regions where waves are less dense

3. Wavelength
Distance between one point on a wave and the nearest point just like it
Crest  crest
Trough trough
Compression  compression
Rarefaction  rarefaction

4. Frequency
Number of wavelengths that pass a certain point in period of time
Units: Hertz (Hz)= 1/s (one per second)
Period
The amount of time it takes one wavelength to pass a point
Units: seconds (s)
Period is inversely proportional to the frequency

5. Practice Problem 1
100 waves pass a dock in 10 seconds. What is the frequency of the wave? f = number of waves/second = 100/10= 10 Hz What is the period of the wave? period= time for one wave = 10/100= 0.1 seconds

6. Wavelength is inversely proportional to Frequency

7. Wave Speed Depends on: Type of wave Temperature of material
Sound waves travel faster through solids and liquids
Light waves travel faster through space
Temperature of material
Higher temperatures, higher speeds

8. Calculating Wave Speed
V (speed in m/s) = f(frequency in Hz) x λ(wavelength in m)

9. Practice Calculation 2
What is the speed of a sound wave that has a wavelength of 2.00 m and a frequency of Hz? V= f λ = * 2 = 341 m/s

10. Amplitude and Energy
Amplitude (intensity) is directly proportional to the energy of the wave
Transverse: distance from midpoint to crest or trough
Compressional: how tightly the medium is pushed together at compressions