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is a vibration that typically propagates as an audible wave of pressure,
through a transmission medium such as a gas, liquid or solid.
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speed of the sound depends on the medium
air, sound travels about 340 m/s
liquid, sound travels fast
solid, sound travels fastest
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from sound is spread over the surface area of a sphere
of sound drops with the square of distance
double the distance, the sound is a quarter as loud
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decibel is a unit of measurement used to express the ratio of one value of a
power or field quantity to another, on a logarithmic scale, the logarithmic
quantity being called the power level or field level, respectively. It can be
used to express a change in value or an absolute value.
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from spreading out, the energy from sound waves can be lost to friction in the
medium. This is called damping or attenuation.
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is an interference pattern between two sounds of slightly different frequencies,
perceived as a periodic variation in volume whose rate is the difference of the
two frequencies. When tuning instruments that can produce sustained tones,
beats can be readily recognized.
areas of constructive interference, the waves add together
areas of destructive interference, the waves oppose each other and cancel
beat frequency is the frequency of the big oscillations
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standing wave, also known as a stationary wave, is a wave which oscillates in
time but whose peak amplitude profile does not move in space. The peak
amplitude of the wave oscillations at any point in space is constant with time,
and the oscillations at different points throughout the wave are in phase.
represent sound-pressure waves with a graph of air pressure
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largest wavelength, smallest frequency wave that can fit in a pipe has adjacent
smallest frequency is the fundamental
pressure is the antinode
pressure is the node
source link Med Orders Tramadol The Doppler Effect
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Doppler effect is the change in frequency or wavelength of a wave in relation
to an observer who is moving relative to the wave source. It is named after the
Austrian physicist Christian Doppler, who described the phenomenon in 1842.