Vibrations and Waves
Practice Test
1.
The formula
represents the period of a pendulum, T. What is the period of a 3.5 m-long pendulum on Earth?
a.
1.4 s
b.
3.2 s
c.
4.6 s
d.
3.8 s
Hint
2.
A trough is __________ of a wave.
a.
the low point
b.
the high point
c.
the midpoint
d.
the starting point
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 half the old period.
b.
It would have no effect.
c.
The new period would be the old period, times the square root of two.
d.
The new period would be the old period, divided by the square root of two.
Hint
4.
The principle of superposition states that __________.
a.
waves from different mediums can combine to form a new wave
b.
waves can never combine
c.
two or more waves can combine to form a new wave
d.
the energy of a wave depends on its position
Hint
5.
A wave with a frequency of 10 Hz and a wavelength of 2 m has a speed of __________.
a.
2 m/s
b.
5 m/s
c.
0.2 m/s
d.
20 m/s
Hint
6.
When a wave pulse strikes a wall, it reflects back and is __________.
a.
inverted
b.
reduced to zero
c.
amplified
d.
changed from compressional to transverse
Hint
