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Sound Needs a Medium
Video
Wave
Characteristics
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HTML5 ]
Show Me The Physics Website
This movie is part of the collection:
Prelinger Archives
Production Company: ERPI Classroom Films, Inc. Distributed by Encyclopedia
Britannica
Audio/Visual: sound, B&W
Creative Commons license: Public Domain
School blocks YouTube? Use link below.
SoundF_WL_Amplitude2.mp4
What is this speaker component called?
What kinds of waves does it produce?
High or low frequency?
Woofer, Outputs low frequency waves
II. Characteristics of Periodic Waves
A.
Frequency(f) =
#vibrations/sec
= # Cycles/# sec
= Hertz (Hz)
Source: Elroy M. Avery School Physics
(New York:
Sheldon and Company, 1895) 202
Clipart ETC
Heinrich Hertz was the first to send
and receive radio waves.
Frequency
- Determined by
Source of Wave,
Not Medium
Cycle = (single vibration)
Ex)
How many cycles between the dots?
3 Cycles
Ex)
10 cycles pass a fixed point in a wave train in 5 seconds.
What is the frequency of the wave?
|
f = |
10 cycles
|
= |
2 cycles
|
5 seconds |
1 sec |
f
=
2 Hertz (Hz)
Top View of a Wave
[ HTML5 ]
showmethephysics.com
Sound Waves
David Kirby - U. of Calif.
Top view of a periodic wave
(Each line is a
crest)
Crest
Physics 2000
Review - Longitudinal or Transverse?
[ Flash ]
Ex) A wave generator operating for
4 seconds produces
the waves drawn below.
Top view of a periodic wave
(Each line is a crest)
How many waves are drawn between
A and B? (Be careful!!)
What is the frequency of this
periodic wave train?
8 cycles
f = 8 cycles/4 sec
f = 2 cycles/sec
Ex)
2
cycles pass a fixed point in a wave train in 10 sec.
What is the frequency ?
|
f = # Cycles/# sec
f = 2 Cycles/10 sec
f = .2 Hz
• Sound,
frequency is
pitch.
Source: Elroy M. Avery School Physics
(New York:
Sheldon and Company, 1895) 247
Clipart ETC
• Light, frequency is
color.
Human Ear:
Frequency
Range
20 Hz - 20,000 Hz.
Did you know dogs are
capable of hearing
higher pitch sounds
than humans?
|
|
The range of frequencies you
can hear changes with age.
How old are you?
How to get rid of teenagers
School blocks YouTube? Download link below.
CBC - Moving Sound Technologies.mov
Ringtones the old folks can't hear
Ear Animation
2006 McGraw-Hill Higher Education
Enrichment
How the Ear Works
How Sound Works
NASAconnect
Sound of a bell in a vacuum
| Onsite
Version |
UC Irvine
Physics and Astronomy Videos
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Mangiacapre., - All Rights Reserved
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Established 1995
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