# Shared Flashcard Set

## Details

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

## Additional Physics Flashcards

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
 Transverselongitudinal
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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