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Chapter 26- Sound

QuestionAnswer
What is a beat? periodic variation in the loudness of sound
Resonance is... the phenomenon that occurs when the frequency of a vibration forced on an object matches the object's natural frequency
What is forced vibration? occurs when an object is made to vibrate by another vibrating object that is nearby
Natural frequency is... the frequency at which an object vibrates when it is disturbed- depends on the elasticity andn shape of the object
A pulse of low-pressured air is... rarefaction
Describe a compression... a pulse of compressed air
Ultrasonic refers to what? any frequency above 20,000 Hertz
Infrasonic refers to what? any frequency below 20 Hertz
What is pitch? a subjective impression about the frequency of sound
____ is a form of energy that spreads throughout space. Sound
Vibrations send rhythmic_____impulses to the ____ which result in the sound of the voice. electrical, brain
All sounds originate in the _____ of material _______. vibrations, objects
Although the original vibration is small, what helps it vibrate? The vibration causes something bigger than it to vibrate.
Vibrations in air come in the form of... longitudinal waves
The frequency of the vibrating object equals the frequency of the _____ ________. waves produced
Frequency is described as what? Pitch
What two things travel outward from the vibrating source? Compressions and rarefactions
Pulses are caused by what? vibrations
Energy travels, NOT ____. medium
Sounds travel in: solids, liquids, and gases
Order of speed from Fast to Slow: solid, liquid, gas
If there are no _____ to compress and expand, there is no sound. molecules
The speed of sound in gasepends on: the temperature, mass of the particles
Speed of sound in material: elasticity
Light is faster than... sound
Water vapor and high temperatures increase/decrease speed of sound in air? increase
Intensity is ______, and loudness is sensed in the _____. objective, brain
Intensity (dB) is based on: amplitude
Sound levels: threshold of pain ____.Normal speech _____.Close whisper _____. 120, 60, 20
What is Corti? the receptor organ in the inner ear
Loud is to ____ as low is to ______. tall, less peaks
Soft is to ____ as high is to _____. short, more peaks
When an object of elastic is disturbed it does what? It vibrates at its own set or frequencies.
Minimum to ____, least to ______ the vibration. produce, continue
Sounding boards are NOT forced into vibration. T or F? F
When does an object resonate? When there is a force to pull it back to its starting position and energy to continue the vibration.
Constructive interference is when a: compression and compression overlap
Destructive interfernce is when a: compression and rarefaction overlap
Beats are caused when 2 mismatched frequencies are sounded together. True or False? True
What is the equation for frequency? number of beats/second
Created by: physics101