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Exam
5A
Name___________________________________
MULTIPLE CHOICE.
Choose the one alternative that best completes the statement or answers the question.
1) If the pressure amplitude of a sound wave doubles, what happens to the decibel level?
A) 9.5dB
B) 5dB
C) 0dB
D) 5dB
E) 10dB
1)
2) One end of a nylon rope is tied to a stationary support at the top of a vertical mine shaft 80m
deep. At the bottom end a weight of 20kg is attached.The mass of the rope is 2kg. A geologist
at the bottom of the rope signals her colleague by jerking the rope sideways. If she stimulated
sinusoidal waves on the rope with frequency 2Hz, how many cycles of the wave fit in the ropes
length?
A) 0.5
B) 1
C) 2
D) 4
E) 8 or more
2)
3) What are:
(a) the amplitude
(b) the frequency
(c) the wavelength
(d) the speed of
a water wave whose displacement
is described by
y(x,t) = 0.5 sin(0.52x  4.6 t), where x,y are in meters and t is in seconds.
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 Spring '05
 wurthmeir
 Thermodynamics

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