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Chapter 25: Vibrations and Waves Questions
Chapter 25: Vibration and Waves Questions
57
Physics
11th Grade
01/05/2012

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Term
Tell me about Red Shift.
Definition
Red Shift is the Doppler effect in light when the object is moving away from me and there is a decrease in the frequency of the light because of the movement.
Term
Tell me what Blue Shift is.
Definition
Blue Shift is the Doppler effect in light when the object is moving toward me and there is an increase in frequency of the light because of the movement.
Term
The apparent change in frequency due to the motion of the source or receiver is called the ______
Definition
Doppler effect
Term
A wiggle in time is a ______________
Definition
vibration
Term
A wiggle in time and space is a ____________
Definition
wave
Term
The time it take a pendulum to swing back and forth is called the _____
Definition
period
Term
Does the period of a pendulum depend upon the mass of the pendulum?
Definition
NO. The period of a pendulum depends upon the length of the radius and g
Term
Name the two things the period of a pendulum depends upon.
Definition
Length of the pendulum, g
Term
Which as the longer period, a long pendulum or a short pendulum?
Definition
Long pendulum
Term
Back and forth vibratory motion is often called (two options)
Definition
Oscillatory motion, simple harmonic motion
Term
Name the Periodic motion in which acceleration is proportional to the distance from an equilibrium position and is directed toward that equilibrium position.
Definition
simple harmonic motion
Term
What are the low points in a sine curve called?
Definition
trough
Term
In a sine wave, what is the distance from the top of one crest to the top of the next crest called?
Definition
lambda, wavelength
Term
How often a vibration occurs is described by its _________________
Definition
frequency
Term
Name the units of Hertz
Definition
cycles/second
Term
AM radio waves are measured in:
Definition
kilohertz, 960 on the dial is
960,000 vibrations/second
Term
A pattern formed by the overlapping of two or more waves that arrive in a region at the same time is called _________________________
Definition
interference pattern
Term
When the crest of one wave overlaps the crest of another, their effects add together. This is called _____________________________
Definition
constructive interference
Term
When the crest of one wave overlaps the trough of another, their individual effects are reduced. This is called _________________
Definition
destructive interference
Term
What is the term applied to two waves for which the crest of one wave arrives at a point at the same time that a trough of the second wave arrives.
Definition
Out of phase
Term
What is the term applied to two or more waves whose crest (and troughs) arrive at a place at the same time so that their effects reinforce each other?
Definition
In phase
Term
The positions on a standing wave with the largest amplitudes are known as __________________
Definition
antinodes
Term
In a standing wave, certain parts of the rope remain stationary. These are called ___________
Definition
nodes
Term
A cone-shaped wave produced by an object moving at supersonic speed through a fluid is called shock wave
Definition
shock wave
Term
What is a curve whose shape represents the crests and troughs of a wave, as traced out by a swinging pendulum that drops a trail of sand over a moving conveyor belt?
Definition
Sine curve
Term
A wave in which the vibration is in the ___________ direction as that in which the wave is traveling is called a longitudinal wave.
Definition
same
Term
A shock wave is produced by overlapping spheres to form a _______.
Definition
cone
Term
Why don't we hear a sonic boom from a slower than sound aircraft?
Definition
because the wave crests reach our ears one at a time.
Term
What is the name of the sharp crack heard when the shock wave that sweeps behind a supersonic aircraft reaches the listener?
Definition
Sonic boom
Term
Standing waves are the result of _____________________________
Definition
interference
Term
Standing waves can be produced in either _________________ or _____________________ waves.
Definition
Transverse
longitudinal
Term
Can a boat travel faster than the speed of the water waves?
Definition
Yes. A boat can travel faster than a wave on the water.
Term
A bow wave is a _______-dimensional wave
Definition
two
Term
A shock wave is a __________-dimensional wave.
Definition
three
Term
What are the units for lambda?
Definition
distance, like meters
Term
What does the symbol f stand for?
Definition
frequency
Term
What are the units of f?
Definition
Hz or cycles/second
Term
When a source moves toward you, do you measure an increase or decrease in wave speed?
Definition
Neither. Wave speed remains the same. Frequency of the wave changes
Term
Long wavelengths have ______________ frequencies.
Definition
low
Term
Short wavelengths have ___________ frequencies
Definition
high
Term
During a concert, sounds from all the instruments reach you at the same time. Why?
Definition
ν Wave speed depends on the medium holding the wave. The sounds are all traveling through air so ν is constant for all frequencies and wavelengths.
Term
Using the equation: ν=f lambda How can the ν be constant (in air) for all frequencies?
Definition
f↑ then lambda↓ f↓ then lambda↑ frequency and wavelength vary inversely, giving a constant ν.
Term
A metronome is set so that it makes 10 complete vibrations in 12 seconds. Find the frequency of the metronome.
Definition
10 vibrations/12 seconds = .833 Hz
Term
While sitting on a pier, Carlos notices that incoming waves are 2 m between crests. If the waves lap against the pier every .5 seconds, find a.) the frequency and b.) the speed of the waves.
Definition
Lambda = 2 m; t = .5 sec/cycle = period; f = 1/.5 = 2; ν=f lambda = (2 meters)(2 cycles/second) = 4 m/s
Term
What is the wavelength of a 340 Hz sound wave when the speed of sound in air is 340 m/s?
Definition
f= 340 Hz; ν = 340 m/s; ν= f lambda; so lambda = 340/340; lambda= 1 meter
Term
Sound waves or percussion waves are what type of waves?
Definition
Longitudinal waves
Term
Can more than one vibration or wave exist at the same time in the same space?
Definition
Yes
Term
When energy is transferred by wave from a vibrating source to a distant receiver, is there transfer of matter between the two points?
Definition
No. The wave moves through the medium. Energy is transferred by a disturbance in the medium.
Term
What does ν stand for?
Definition
Velocity or wave speed
Term
What is the frequency per second of a 100 Hz wave?
Definition
100 Hz = 100 cycles/second
Term
The Sears Tower has a frequency of .1 Hz. What is its period?
Definition
f = .1Hz = .1 cycle/second; period = 1/f = sec/.1 cycle = 10 seconds/cycle
Term
FM Radio waves are measured in ________________
Definition
megahertz, 101FM is 101,000,000 cycles/second
Term
Radar and Microwave ovens operate in ___________________
Definition
gigahertz or 100,000,000,000 cycles/second
Term
The frequency of the vibrating source and the frequency of the _______ it produces are the same
Definition
wave
Term
The Doppler effect occurs for __________, ___________, and ________.
Definition
light, sound, and time
Term
A wave with vibration at right angles to the direction the wave is traveling is called a __________ ______
Definition
transverse wave
Term
What is the name of the V-shaped wave produced by an object moving on a liquid surface faster than the wave speed?
Definition
Bow waves
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