Vibrations and Waves
Practice Test
1.
Mechanical waves require __________.
a.
a medium
b.
a vacuum
c.
a gas
d.
a solid
Hint
2.
The formula
represents the period of a pendulum, T. What is the period of a 3.5 m-long pendulum on Earth?
a.
4.6 s
b.
1.4 s
c.
3.8 s
d.
3.2 s
Hint
3.
In Figure 14-4, if you doubled the mass of the pendulum, what effect, if any, would it have on its period?
a.
The new period would be the old period, divided by the square root of two.
b.
The new period would be the old period, times the square root of two.
c.
It would have no effect.
d.
The new period would be half the old period.
Hint
4.
A __________ wave bounces off a boundary.
a.
reflected
b.
surface
c.
incident
d.
transverse
Hint
5.
When a continuous wave meets a boundary that transmits the wave at a lower speed, the wavelength __________.
a.
becomes negative
b.
decreases
c.
interferes with itself
d.
increases
Hint
6.
The speed of a wave depends on the __________.
a.
medium
b.
frequency
c.
amplitude
d.
energy
Hint
