thisthis is a demonstration of what wave phenomenon…
TRANSCRIPT
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WAVES & SOUND REVIEW
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This is a demonstration of what wave phenomenon…
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Resonance
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Can sound waves travel in a vacuum?
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NO, they need a medium to travel through.
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The distance between one waves crest and the next waves crest is called a ___________.
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wavelength
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For each second you count between lightning and the thunder it produces, how far away does it mean the lightning is from you?
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340 meters
About 1/5th of a mile Or about 1/3rd of a kilometer
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Noise cancelling headphones are an example of ________ interference.
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Destructive
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What causes a tsunami?
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An underwater earthquake OR a massive landslide
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If an ambulance is headed toward you the frequency of the sound waves coming toward you is ________ than normal.
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Higher frequency
Shorter wavelength
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The frequency of the sound coming from that same ambulance would be ________ than normal as it moves a way from you
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Lower frequency
Higher wavelength
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A wave travels a distance of 20 meters in a time of 4 seconds, what is the speed of the wave?
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5 m/s
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Which of these would sound travel the fastest through
Salt water Fresh water A wood cabinet A steel beam
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Steel beam, because it is the most rigid
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Is there sound in outer space?
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NO, space is a vacuum and sound needs a medium to travel through
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On a standing wave, the points that do not move are referred to as…..
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Nodes
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The number of times a wave vibrates each second is referred to as _______
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frequency
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The amount of time it takes each wave to pass is referred to as _______
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Period
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What type of wave is a sound wave?
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Longitudinal wave
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Waves in the ocean are what type of wave
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Transverse
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What is the proper unit for frequency?
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Hertz
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An oceanic depth-sounding vessel surveys the ocean bottom with ultrasonic sound that travels 1530 m/s in seawater, and finds a 10-second time delay of the echo to the ocean floor and back. The ocean depth there is
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7650 meters
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Beats are produced by two tuning forks that are sounded together, if one tuning fork has a frequency of 300 Hz and the other has a frequency of 305 Hz, what will be the frequency of the beats they produce?
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5 Hz
Difference between frequencies
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What destroyed the Tacoma Narrows bridge?
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Resonance/ Standing Wave A standing wave was created when the
bridge resonated at its natural frequency as caused by the wind.
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A 680 Hz sound wave that travels through air at a speed of 340 m/s would have a wavelength of____?
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.5 meters
V = fλ So λ = v/ f or 340 / 680
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12 full waves pass a dock in a time of 6 seconds.
A) what is the frequency of the waves?
B) What is the period of the waves
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A) 2 Hz
B) .5 seconds
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A skipper on a boat notices wave crests passing the anchor chain every 6 seconds. The skipper estimates the distance between crests at 30 m. What is the speed of the water waves?
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In what kind of situation(s) would the doppler effect occur?
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If a source of sound waves is moving toward you or away from you
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If the frequency of a set of waves is increased, what will happen to wavelength?
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It will go down
Inverse relationship
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What of these wave properties determines the pitch of a sound wave?
Frequency Wavelength Period Speed
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Frequency
High frequency high pitch
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What is the source of all wave motion?
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Vibration
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A wave created by shaking a rope up and down is called a ______ wave.
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Transverse
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A wave has a wavelength of 1.5 meters. During a single period this wave has travelled how far?
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1.5 meters
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The amplitude of a wave is 3.0 meters, the top to bottom distance of the disturbance would be
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6 meters
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What property of a wave determines loudness?
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Amplitude
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Two waves that are in-phase with each other will undergo _______ interference.
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Constructive
New larger wave will be produced Amplitudes add together
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The phenomenon of ‘beats’ results from which of these
Interference Diffraction Frequency modulation resonance
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interference
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T or F. We would hear a sonic boom the instant a supersonic plane flew overhead.
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False, it would be after the plane was directly overhead because the planes sound is trailing it
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T or F. Resonance occurs when an object vibrates at its natural frequency
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True
Every elastic object has its own natural frequency, when it vibrates at that frequency a large increase in amplitude will happen
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A certain ocean wave has a frequency of 10 hertz and a wavelength of 3 meters. What is the wave’s speed?
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30 m/s
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The period of a wave is 8 seconds, what is its frequency?
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1/8 Hz
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How do we use the Doppler Effect to tell us that the universe is still expanding?
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All galaxies are ‘red-shifted’ meaning they have longer wavelengths of light, this tells us they are all moving away from us…. Universe is expanding
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If you have created a standing wave with a slinky and increase the frequency with which you are shaking the slinky what will happen to the number of waves in the slinky?
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Number of waves will increase
Wavelength of each wave will decrease more waves crammed into the same length
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The regions in between the compressed regions of a sound wave are called _________.
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Rarefactions
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The amplitude of a water wave is .5 meters. If a raft has one full wave pass under it… through how much distance will it vibrate?
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2 meters
4 amplitudes
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How is a sonic boom formed?
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Something moving faster than the speed of sound
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What other than a jet-powered vehicle can create a sonic boom?
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Crack of a whip
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What does ‘ultrasonic’ mean?
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Sound waves that have a frequency higher than that which is audible >20,000 Hz.