Physics 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.
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.
The amplitude of a particular wave is 1 meter. The top-to-bottom distance of the disturbance is
2 m.
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
A wave travels an average distance of 6 meters in one second. What is the wave's velocity?
6 m/s
Wave interference occurs for
All of the above choices are correct.
An object that completes 100 vibrations in 5 seconds has a period of
None of the above choices are correct.
A heavy person and a light person swing to and fro on swings of the same length. Who has the longer period?
The period is the same.
Interference is a phenomenon that occurs primarily in _______.
all kinds of waves
The Doppler effect is characteristic of
all of the above choices.
The vibrations along a longitudinal wave move in a direction _______.
along and parallel to the wave
The vibrations of a longitudinal wave move in a direction
along the direction of wave travel.
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.
If a pendulum is shorted, does its period increase or decrease?
decrease
How about the wavelength reaching your ear?
decreases
A Doppler effect occurs when a source of sound moves
either towards you or away from you.
A shock wave occurs when an aircraft travels _______.
faster than the speed of sound
When a sound source approaches a stationary listener, the listener experiences an increase in sound _______.
frequency
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.
If a pendulum is shortened, does its frequency increase or decrease?
increase
A railroad locomotive is at rest with its whistle shrieking, then starts moving toward you. Does the frequency of sound that you hear increase, decrease, or stay the same?
increases
When a pendulum clock at sea level is taken to the top of a high mountain, it will
lose time.
A node is a position of
minimum amplitude.
Does the period of a pendulum depend on the mass of the bob?
no
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
During a single period, the distance traveled by a wave is
one wavelength.
The vibrations along a transverse wave move in a direction _______.
perpendicular to the wave
You dip your finger repeatedly into water and make waves. If you dip your finger more frequently, the wavelength of the waves
shortens.
How about the speed of sound in the air between you and the locomotive?
stays the same
An aircraft that flies faster than the speed of sound is said to be
supersonic.
A Doppler effect occurs when a source of sound moves
toward you.
The frequency of a simple pendulum depends on
two of these.
Red light has a longer wavelength than violet light. Which has the greater frequency?
violet light.
The speed of a wave can be found by multiplying its frequency by its _______.
wavelength
On the length of the string?
yes