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Physics 2306
Spring 2008
First Exam
FORM A
1) The pressure fluctuation from ambient pressure due to a sound wave is given by
p(x,t) = (2.0
×
10
5
N/m
2
) sin[(5
π
radians/meter) x + (4000
π
radians/second) t]
Which one of the following statements is true?
A.
The wave is a transverse wave and the pressure fluctuation and the displacement of
air molecules are in phase.
B.
The wave is a transverse wave and the pressure fluctuation and the displacement of
air molecules are 90
°
out of phase.
C.
The wave moves in the +xdirection with a speed equal to 800 m/s.
D.
The wave is a transverse wave and the pressure fluctuation and the displacement of
air molecules are 180
°
out of phase.
E.
The wave has an antinode at x = 0.25 meters.
F.
The wave is a longitudinal wave and the pressure fluctuation and the displacement
of air molecules are in phase.
G.
The wave is a longitudinal wave and the pressure fluctuation and the
displacement of air molecules are 90 degrees out of phase.
H.
The wave has a node at time equal to 0.0010 seconds.
27) The displacement of air molecules from equilibrium due to a sound wave is given by
s(x,t) = (0.020 microns)cos[(6.0
π
rad/meter)x
−
(2400
π
rad/sec)t]
2) What is the amplitude (in microns) of the displacement?
A.
6.0
π
B.
0.33
C.
0.020
D.
50
E.
0.0025
F.
8.3E04
G.
400
H.
2400
π
3) What is the period (in seconds) of the wave?
A.
6.0
π
B.
0.33
C.
0.020
D.
50
E.
0.0025
F.
8.3E04
G.
400
H.
2400
π
4) What is the wavelength (in meters) of the wave?
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View Full DocumentA.
6.0
π
B.
0.33
C.
0.020
D.
50
E.
0.0025
F.
8.3E04
G.
400
H.
2400
π
5) What is the velocity of propagation (in meters/second) of the wave (positive wave
velocity is in the +xdirection and negative wave velocity is in the
−
xdirection)?
A.
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 Spring '06
 YKim
 Physics

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