# Properties of Mechanical Waves.ppt

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```					Properties of Mechanical
Waves
Section 17.2
Frequency and Period
• Periodic motion- any motion that repeats at
a regular interval

• Waves have periodic motion
Frequency and Period
• Period- time of one cycle (motion to
– Units: seconds (s)
Frequency and Period
• Frequency- number of cycles per
second
– Units: hertz (Hz) = /s or s-1
Wavelength
• Wavelength- distance between a point
on one wave and the same point on
the cycle of the next wave
– For longitudinal waves, it is the distance
between compressions
Wavelength
• Wavelength- distance between a point
on one wave and the same point on
the cycle of the next wave
– For transverse waves, it is the distance
Wave Speed

• Speed: m/s
• Wavelength: m
• Frequency: Hz
Amplitude
• Amplitude- the maximum
displacement of the medium from its
rest position
– aka “height”
– The more energy a wave has, the greater
its amplitude
Reviewing Concepts
1. How is wavelength related to frequency if
the wave is traveling at a constant speed?
2. How is energy related to the amplitude of
a wave?
3. Describe two ways to measure the
wavelength of wave.
4. If you double the frequency of a wave,
what will happen to its wavelength if the
speed does not change?

```
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