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# Chapter 10

### DHS PS Ch. 10 - Sound (2015/2016)

A material through which a wave transfers energy is called a? medium
Sound would not travel through this type of medium? vacuum
What type of waves are sound waves? longitudinal
A repeating disturbance that transfers energy through matter or open space is a? wave
What do waves carry? energy
In what type of waves does matter in the medium move back and forth and in the same direction the wave travels? longitudinal
What is a measure of the energy in a wave? amplitude
_________ is how many wavelengths pass a fixed point each second? frequency
What is the less dense region of a longitudinal wave called? rarefaction
As a frequency increases, wavelength _____? decreases
Vibrating molecules pass energy on to ______ ? neighboring molecules
All waves are produced by something that ______ ? vibrates
A material through which a wave travels is called a ____? medium
A medium may be what type of matter? solid, liquid, or a gas
Frequency is expressed in? hertz (Hz)
As frequency increases wavelength? decreases
The frequency of a wave equals the rate of? vibration of the souce that creates it
How fast a wave moves forward is called? wave velocity
Sound waves travel faster in this than in a gas? liquids and solids
The more energy a wave carries, its amplitude will be ____ ? greater
The denser the compressions, the ______ the amplitude is and the more energy the wave carries larger
The less dense the rarefactions, the ______ the amplitude and the more energy the wave carries. larger
When does reflection happen? when a wave strikes an object and bounces off of it
The angle of incidence of a wave is always equal to the angle of? reflection
The bending of a wave caused by a change in its speed as it moves from one medium to another is called a? refraction
What is the ability of an object to vibrate by absorbing energy at its natural frequency? resonance
The ability of an object to vibrate by absorbing energy at its natural frequency is called? resonance
Sounds are produces by? vibrations
How does temperature of a medium affect the speed of sound waves? as the temperature of a substance increases, sound waves in it move faster
In the human ear, sound waves are gathered in the? outer ear
What is the spiral-shaped structure filled with liquid in the human ear? cochlea
What is the amount of energy that flows through a certain area in a specific amount of time called? intensity
The human perception of sound intensity is called? loudness
The intensity of sound is measure din units called? decibels
The human perception of sound frequency is called? pitch
Waves that have sound frequencies above 20,000 Hz are called? ultrasonic
The change in pitch due to a moving wave source is called? the Doppler effect
As an ambulance races toward you and then past you, what would the pitch of its siren do? higher then lower
If the intensity of a sound decreases, what else decreases? loudness
A tuning fork starts to vibrate when a certian note is played on the piano. This is an example of? resonance
The intensity of a sound describes? it's loudness at a particular distance
The way your brain interprets the intensity of a sound is called? loudness
How does temperature of a medium affect the speed of sound waves? as the temperature of a substance increases, sound waves in it move faster
A wave will travel only as long as it has what to carry it? energy
For the Doppler effect to occur what must happen? either source or listener must be moving
The pitch of a sound is most closely related to the? frequency
When a sound wave strikes your eardrum, it causes forced vibrations that are transferred to the? hammer, anvil, and stirrup
The unit used to measure frequency is called? hertz
If you double the distance from a sound source, the intensity will ______ ? 1/4th
If you triple the distance from a sound source, the intensity will ______ ? 1/9th
If you quadruple the distance from a sound source, the intensity will ______ ? 1/16th
An 85 dB sound is how many times more intense that a 45 dB sound? 10,000X
An 65 dB sound is how many times more intense that a 55 dB sound? 10X
An 115 dB sound is how many times more intense that a 65 dB sound? 100,000X
The study of sound is called ____ ? acoustics
Bats and dolphins use ____ to navigate and find prey. echolocation
The echoing effect produced by many reflections of sound is called _____ . reverberation
Cloth drapes, cushioned seats, and carped floors help to _____ reverberations. reduce
_______ is a system that uses the reflection of underwater sound waves to detect objects. sonar
Sounds with frequencies greater than 20,000 Hz are known as _____ . ultrasonic
An underwater microphone used to pick up the reflected sonar signal is called a _______ . hydrophone
Video image of an ultrasound is called a ____ . sonogram
Ultrasound can be used to break up _____ _______ . kidney stones
Humans can hear sound frequencies between ______ and ______ . 20 Hz to 20,000 Hz
Dogs can hear frequencies up to _______. 35,000 Hz
Bats can hear frequencies up to _____ . 100,000 Hz