Conceptual Physics (TESC) Chapter 19
If the frequency of a certain wave is 10 hertz, its period is
0.1 second.
A weight suspended from a spring bobs up and down over a distance of 1 meter in two seconds. Its frequency is
0.5 hertz.
An object that completes 10 vibrations in 20 seconds has a frequency of
0.5 hertz.
The frequency of the second hand on a clock is
1/60 hertz.
A floating object oscillates up and down 2 complete cycles in 1 second as a water wave of wavelength 5 meters passes by. The speed of the wave is
10 m/s
A tuning fork of frequency 200 hertz will resonate if a sound wave incident on it has a frequency of
100 hertz.
How many vibrations per second are associated with a 101-MHz radio wave?
101,000,000
A floating leaf oscillates up and down two complete cycles each second as a water wave passes by. What is the wave's frequency?
2 hertz
An object that completes 20 vibrations in 10 seconds has a frequency of
2 hertz.
A fishing-boat captain returns to port saying, "It's rough out there - the waves are 4 meters high." He probably means that the amplitude of the waves is
2 m.
The amplitude of a particular wave is 1 meter. The top-to-bottom distance of the disturbance is
2 m.
As a train of water waves goes by, a piece of cork floating on the water bobs up and down one complete cycle each second. The waves are 2 meters long. What is the speed of the wave?
2 m/s
A floating leaf oscillates up and down two complete cycles in one second as a water wave passes by. The wave's wavelength is 10 meters. What is the wave's speed?
20 m/s
A wave oscillates up and down two complete cycles each second. If the wave travels an average distance of 6 meters in one second, its wavelength is
3 m.
A skipper on a boat notices wave crests passing the anchor chain every 5 seconds. The skipper estimates the distance between crests is 15 m. What is the speed of the water waves?
3 m/s
Radio waves travel at the speed of light, 300,000 km/s. The wavelength of a radio wave received at 100 megahertz is
3.0 m.
A wave travels an average distance of 6 meters in one second. What is the wave's velocity?
6 m/s
A 60-vibration-per-second wave travels 30 meters in 1 second. Its frequency is
60 hertz and it travels at 30 m/s.
The period of the second hand on a clock is
60 seconds
An object that completes 100 vibrations in 5 seconds has a period of
None of these.
A standing wave occurs when
a wave reflects upon itself.
The vibrations of a longitudinal wave move in a direction
along the direction of wave travel.
Like a transverse wave, a longitudinal wave has
amplitude, frequency, wavelength, and speed.
Some of a wave's energy dissipates as heat. In time, this will reduce the wave's
amplitude.
A wave barrier is produced when a wave source moves
as fast as the waves it produces.
The vibrations of a transverse wave move in a direction
at right angles to the direction of wave travel.
For light, a red shift indicates that the light source is moving
away from you.
At a concert the oboe is playing a long steady note as you walk away from the stage at an accelerating velocity toward the rest room. The pitch of the sound that you hear is
continually decreasing
A Doppler effect occurs when a source of sound moves
either towards you or away from you.
A bow wave is produced when a wave source moves
faster than the waves it produces.
An observer on the ground hears a sonic boom which is created by an airplane flying at a speed
greater than the speed of sound.
If you double the frequency of a vibrating object, its period
halves.
The stride of a horse depends somewhat on the pendulum-like swing of its legs. This stride would be higher in frequency if more of the mass in its legs were concentrated
in the upper part, nearer the horse's body.
If at a concert you run toward the orchestra, the frequency of the sound you hear will be
increased.
If at a concert, a wind blows directly from the orchestra toward you, the speed of the sound you hear will be
increased.
Suppose a simple pendulum is suspended in an elevator. When the elevator is accelerating upward, the frequency of the pendulum
increases.
The sonic boom at ground level produced by an aircraft will be reduced if the aircraft
is smaller, flies higher, and is more streamlined.
When a pendulum clock at sea level is taken to the top of a high mountain, it will
lose time.
The source of a sonic boom
may or may not be an emitter of sound.
A node is a position of
minimum amplitude
As a supersonic craft increases in speed, the angle of its V-shaped shock wave becomes
narrower.
A wave travels an average distance of 1 meter in 1 second with a frequency of 1 hertz. Its amplitude is
not enough information to say
A jet traveling at 1500 km/hr passes between observers A and B. In a short time a sonic boom will be heard by
observers A and B, but not the pilot.
During a single period, the distance traveled by a wave is
one wavelength.
To say that one wave is out of phase with another is to say that the waves are
out of step.
A child swings to and fro on a playground swing. If the child stands rather than sits, the time for a to-and-fro swing is
shortened.
You dip your finger repeatedly into water and make waves. If you dip your finger more frequently, the wavelength of the waves
shortens.
The pendulum with the greatest frequency is the pendulum with the
shortest period.
A pendulum clock at high altitudes runs
slow.
Which of the following is not a transverse wave?
sound
Wave interference occurs for
sound waves; light waves; water waves.
An aircraft that flies faster than the speed of sound is said to be
supersonic.
In a longitudinal wave the compressions and rarefactions travel in
the same direction.
A Doppler effect occurs when a source of sound moves
toward you.
The frequency of a simple pendulum depends on
two of these (length and mass)
A common source of wave motion is a
vibrating object.
A wiggle in time is a
vibration.
The Doppler effect is characteristic of
water waves; sound waves; light waves.