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Sound waves
Reading: 17.117.4
Homework:
Chapter 17,
Problems 6, 42, & 62
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View Full Document Waves
• result from periodic disturbance
• same period (frequency) as source
• characterized by
–amp
l
i
tude
(how far do the “bits” move from their
equilibrium positions)
–pe
r
iod
(how long does it take for each “bit” to go
through one cycle) or
frequency
– wavelength
(over what distance does the cycle
repeat in a freeze frame)
– speed
(how fast is the energy transferred)
reeze Time
easure wavelength (
λ
) and amplitude (A)
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View Full Document Boxcars
λ
Units?
Counting boxcars is like counting waves …
Follow a single point
connect
the dots
position
time
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View Full Document Follow a single point
What is the wavelength?
Summary
SPACIAL
TEMPORAL
• Freeze time (snapshot)
– amplitude and wavelength
• Follow a single point
– amplitude and period
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View Full Document Problem:
Points A and B are marked with
pieces of yarn.
How is each piece of yarn
moving?
B
A
a.
A up and B down
b. A down and B up
c.
Both down
d. Both up
e.
A left and B right
Problem:
Points A and B are marked with
pieces of yarn.
How is each piece of yarn
moving?
B
A
a.
A up and B down
b. A down and B up
c.
Both down
d. Both up
e.
A left and B right
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View Full Document You see waves rolling onto the beach and
estimate the wavelength at about 3.0 m.
You
measure the time between wave crests at 0.50
s.
What is the speed of the waves?
3.0 m
v
= ?
AB
v
=
λ
/
T
but, 1/
T
=
f
How long for the crest at A to reach B?
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This note was uploaded on 04/13/2008 for the course PHYS 211 taught by Professor Shannon during the Spring '08 term at MSU Bozeman.
 Spring '08
 Shannon
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