Vocabulary
Speed of Sound
Real World
Waves
Wild Card
Music?
100
A sound wave is a _____________ wave.
What is longitudinal (produced by vibrating objects).
100
As a sound source approaches you, the speed of the wave __________?
a. increase
b. decreases
c. remains the same
What is c. remains the same
100
Which would transmit sound the fastest?
a. steel bridge
b. wood ladder
c. water
d. a vacuum
What is a. steel bridge (sound waves cannot ravel in a vacuum).
100
The source of all wave motion is a ___________.
What is vibration.
100
Which travels the faster?
a. sound
b. light
What is b. light
100
By changing either the Medium ( Changing the speed) or the wave length, you can change the _____ ______ of an object
What is Natural frequency
200
What is resonance?
What is when an object is forced to vibrate at its natural frequency (Ex: a singer shattering crystal glass when singing high pitched)
200
T/F: Sound will travel faster in water than ice.
What is False-it would travel fastest in ice.
200
T/F: Sound waves will travel faster in air on a cold day.
What is False-sound waves depend on the temperature in the air and travel faster in warmer temperatures.
200
The time needed for a wave to make one complete cycle is its _______________.
What is period
200
Noise canceling earphones are a _____________ interference.
a. destructive
b. non-destructive
c. constructive
d. none of the above
What is a. destructive
200
______ can be varied by changing the size of the Meduim
What is Wavelength
300
Interference is ?
What is when two waves are at the same place at the same time (the phenomenon of beats is interference).
300
A sound of 50 decibels compared to a sound at 10 decibels is ___________ times more intense.
What is 10,000
300
What happened to The Tacoma Bridge
What is it collapsed due to resonance.
300
List four properties of a longitudinal wave:
What is speed, frequency, wavelength, amplitude (sound is an example of a longitudinal wave).
300
If you double the frequency of a vibrating object its period _______________.
a. doubles
b. halves
c. remains the same.
What is b. halves
300
When two object vibrate at frequencies that have a mathmatical relationship, they make ______
What is music
For a bonus when two objects vibrate that do not have a mathematical relationship, they make______
400
Define Hertz
What is unit of frequency (the higher the frequency, the shorter the wavelength).
400
If two waves arrive at the same place at the same time and each have an amplitude of 2.5, what is the resulting amplitude?
What is 5 m
400
T/F: When an airplane fly's faster than the speed of sound it produces a shock wave.
What is True-it is super-sonic! People on the ground can hear a sonic boom, which is defined by sound being swept continuously behind a plane flying faster than the speed of sound.
400
T/F: Sound is a transverse wave.
What is False-transverse waves are light, radio waves, shaking a rope, etc . ..
400
The _________ effect is when sound moves either toward or away from you.
What is Doppler (it is the change in frequency due to the motion of the observer).
400
______ is when an object vibrating at its natural frequency
What is resonance
500
Define wavelength
What is distance between successive identical parts of a wave.
500
If the period of a wave is 10 seconds, what is the frequency of the wave?
What is .10 Hertz
500
The speed of sound in dry air at 20 Celsius is 340 m/s. How far away is a jet when you notice a 2 second delay between seeing the plane and hearing it?
What is (x 2) = 680 m
500
If a standing wave's amplitude is 4 m, what is the distance from top to bottom of the disturbance?
What is 8 m
500
Radio waves travel at the speed of light, which is 300,000 km/s. The wavelength of the radio wave at 200 megahertz is ___________m.
What is 1.5
500
What is another name for Antinose?
What is noise cancellation
600
Define Ultrasonic
sound frequencies beyond the range of human hearing
600
Can wind travel faster than the speed of sound?
What is no, wind's speed is the movement of air molecules, and sound is the speed at which the wave propagates through the air
600
What determines the pitch of a sound?
What is its frequency
600
Label the sketch with: Wavelength, Trough, Amplitude, Crest
600
Dolphins use ______ to "see" their surroundings
Echolocation
600
To experience the best acoustics in a room you should use a combination of these two acoustic surfaces
What is diffusion and absorption