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Created by Mr. Hemmert
SOUND WAVES
Alabama Course of StudyP2. Compare different pitches of sound
produced by changing the size, tension, amount, or type of vibrating material.
Review__________ is how high, or low a sound is.
Pitch
Review___________ measures how loud or soft a
sound is.
Intensity
ReviewWhat do we use to measure the intensity
of common sounds?
Decibel (dB)
Sound Waves
WavelengthWavelength
describes the distance between the two points on a wave.
Image from: http://science.hq.nasa.gov
FrequencyFrequency is the number of waves that pass
in a second.
AmplitudeAmplitude
describes how much energy a wave has by the height of the sound wave.
For transverse waves, you measure the amplitude by starting at the rest position to the top of the wave.
Frequency and PitchRemember that pitch describes
how high or low a sound is and frequency refers to the number of waves that pass in a second or a given amount of time.
If the frequency of a sound wave is high and the waves are close together, then the pitch is going to be high also.
If the frequency of a sound wave is low and the sound waves are spread far apart, then the pitch will be low.
Frequency and Pitch
Which animal do you think would produce a high frequency sound wave?
Image: norcalblogs.com
Amplitude and LoudnessRemember that intensity describes how
loud or soft a sound can be and the amplitude measures the intensity of a sound wave. Therefore, sound waves with larger amplitudes are louder.
Open your book to page 419 and look at the image on the right.
Measuring Sound WavesTo measure sound waves, you can use an
oscilloscope (uh-sil-uh-skohp). This instrument has a screen on the front
that displays a picture of sound waves.
Resources http://scifiles.larc.nasa.gov/text/kids/Probl
em_Board/problems/sound/sound_waves2.html (Frequency and Pitch)
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