A stretched string has a fundamental frequency of 165 Hz.
Someone nearby sings a note at a frequency of 495 Hz.
As a result, the string:
1. Will begin to vibrate
2. Will not vibrate at all
3. Might vibrate…depends
on the song
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33% 33% 33%
30
The sources A and B are identical, emitting waves with
wavelngth . Waves from each source travel along the
path shown. What distance smallest X is necessary for the
waves to be completely out of phase at the Line shown?
A
D
B
X
X
1.
2.
3.
4.
5.
X= D
X= D/2
X= /4
X= 
X= /2
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The two sources A and B are identical, emitting waves of
wavelength . They are separated by a distance D=1.5,
equally spaced from the origin along the y-axis.
What type of interference occurs at point P1?
Fully destructive
Mostly destructive
Fully constructive
Depends on the distance
of P1 from the origin
A
D
P1
B
25% 25% 25% 25%
...
tiv
e
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v
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1.
2.
3.
4.
P2
30
The two sources A and B are identical, emitting waves of
wavelength . They are separated by a distance D=1.5,
equally spaced from the origin along the y-axis.
What type of interference occurs at point P2?
1.
2.
3.
4.
Fully destructive
Mostly destructive
Fully constructive
Depends on the distance
of P2 from the origin
P2
A
D
P1
B
25%25%25%25%
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30
Are there any other points besides P1 where the
interference is fully constructive, and if so, how many
such points (including P1) are there?
No other points
There are 2 total
There are 4 total
There are 6 total
25%25%25%25%
A
D
P1
B
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ts
1.
2.
3.
4.
P2