# Properties of Waves.ppt

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```					          Properties of Waves
• Objectives:
– Identify and describe four wave properties
(amplitude, wavelength, frequency and wave
speed)
– Explain how amplitude and frequency are
related to the energy of a wave.
The amplitude of a wave is the maximum
distance the wave vibrates from its rest
position
The rest position is where the particles of a
medium stay when there are no
disturbances.
The larger the amplitude is, the taller the
wave is
Amplitude is a
measurement of
the distance
particles in the
medium vibrate as
a wave passes
through.
The amplitude of a
sound wave is its
loudness.
A wave with a large amplitude carries more energy than
a wave with a small amplitude
A wavelength is the distance between any two
adjacent crests or compressions in a series of
waves.
The distance between two adjacent troughs or
rarefactions is also a wavelength.
The wavelength can be measured from any
point on one wave to the corresponding point
on the next wave
The wavelength of the
wave in the diagram
above is given by
letter ______.
The amplitude of the
wave in the diagram
above is given by
letter _____.
Indicate the interval which represents one
full wavelength.

1.  a to c
2.  b to d
3.  a to g

4.  c to g
The number of waves produced in a given
amount of time is the frequency of the wave.
You can measure frequency by counting either
the number of crests or the number of troughs
that pass a point in a certain amount of time
Frequency is usually expressed in hertz (Hz)
One hertz equals one wave per second
If the amplitudes are equal, high-frequency
waves carry more energy than low-frequency
waves
Because frequency and wavelength are so closely
related, you can relate the amount of energy
carried by a wave to the wavelength.
A wave with a short wavelength carries more
energy than a wave with a long wavelength.
• Review:
– The shorter the wavelength the
higher the frequency
– The higher the frequency the
greater the energy
Wave Speed
Wave speed is the speed at which a wave
travels.
Speed is the distance traveled over time, so
wave speed can be found by measuring
the distance a single crest or compression
travels in a given amount of time.
The speed of a wave depends on the
medium in which the wave is traveling.
For example, the wave speed of sound in
air is about 340 meters per second, but
the wave speed of sound in steel is
Wave equations
Wave speed is equal to the frequency multiplied by
the wavelength
Wavelength is equal to the wave speed divided by
the frequency
Frequency is equal to the wave speed divided by
the wavelength
What is the frequency of a wave if it has a speed of 12
centimeters per second and a wavelength of 3
centimeters?

A wave has a frequency of 5 hertz and a wave speed of
18 meters per second. What is its wavelength?

Did you know that the speed of light is about 300,000,000
meters per second.  That is about 880,000 times faster
than sound.

```
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