Origin of Sound
Properties of Sound
Loudness
Resonance
Interference and Beats
100
The origin of all sound waves.
What is a vibration?
100
A high pressure region of a sound wave
What is a compression?
100
The unit used to measure loudness
What is a decibel?
100
The frequency at which an object will vibrate at when disturbed.
What is natural frequency?
100
Two sound waves combining to become louder.
What is constructive interference?
200
How high or low a sound is perceived.
What is pitch?
200
The type of wave that sound is
What is longitudinal?
200
The inventor of the telephone.
Who is Alexander Graham Bell?
200
This occurs when an object is made to vibrate by another vibrating object nearby.
What is a forced vibration?
200
Two sound waves are out of phase
What is destructive interference?
300
The lowest pitch a human can hear
What is 20 Hz?
300
The approximate speed of sound in air
What is 340 m/s?
300
The approximate dB level that you begin to lose hearing.
What is 85 dB?
300
The Indian instrument that has "sympathetic" strings that are forced to resonate even though they are never plucked.
What is the Sitar?
300
This is what you hear when two notes almost the same pitch create a periodic loud and soft sound
What are beats?
400
Frequencies that are above 20,000 Hz
What is ultrasonic?
400
The number of seconds that sound will travel approximately a mile in air
What is 5 seconds?
400
The dB level of the threshold of pain.
What is 120 dB?
400
The physics phenomenon that occurs if a group of people all walk in step while crossing a bridge and match the natural frequency of the bridge.
What is resonance?
400
This is the amount of steps that will match up if you walk at 70 steps in one minute and your friend takes 72 steps in the same time.
What is two steps?
500
A creature that can hear frequencies over 100,000 Hz.
What is a bat?
500
The property of solids that determines the speed of sound in it
What is elasticity?
500
The number of times louder busy street traffic is than a library
What is 1,000 times?
500
The name of the bridge in Washington state that was destroyed by wind that was mistakenly thought to have happened because of resonance.
What is the Tacoma Narrows bridge?
500
The pattern that forms by two overlapping combs that have different teeth spacing.
What is a moire pattern?
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