Study Physics Chp. 13 Review Flash Cards

 
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Physics Chp. 13 Review

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How does the wavelength change when the frequency of sound increases? (assume the medium is constant)
decreases
How does the pitch of sound made by an instrument change as you increase the length of the instrument?
decreases
What is the equation tells us the frequency needed to produce a certain standing wave patter?
f = nv/2L (n = 1,2,3,...)
f = nv/4L (n = 1,3,5,...)
What do standing waves correspond to when we experience sound?
notes played on an instrument
What does destructive interference produce in sound?
a softer sound or no sound
What does constructive interference produce in sound?
a louder sound
What is the relationship between intensity, dB, and loudness?
if intensity is multiplied by 10^x
dB goes up by +10x
loudness is multiplied by 2^x
What does amplitude correspond to when we experience sound?
volume
What is the equation that relates frequency and wavelength?
v = λf
What is the equation for the speed of a wave?
v = ∆x/∆t
How does the frequency change when the source and observer are getting closer together? When they are moving farther apart?
closer together: higher frequency
farther apart: lower frequency
What is the Doppler Effect?
The change in frequency due to a moving source, observer, or both
What are sound above the range of human hearing called?
ultrasonic
What are sounds below the range of human hearing called?
infrasonic
How does the speed of sound change with temperature?
faster in high temperature, slower in low temperature
What is range of human hearing?
20-20,000 hz
What does frequency correspond to when we experience sound?
pitch
What is the typical speed of sound in air at room temperature?
340 m/s
What type of medium does sound travel the fastest? The slowest?
fastest in a solid, slowest in a gas
What determines the speed of sound?
the medium it travels through
What are the points of high pressure and low pressure of a sound wave called?
compressions and rarefactions
What type of wave is sound?
longitudinal
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