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23 Cards in this Set
- Front
- Back
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what kind of waves are sound waves
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longitudinal waves
mechanical waves |
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define pitch
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pitch is the perceived highness or lowness of a sound
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what does pitch relate to
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frequency--pitch is determined by the frequency of the wave
greater frequency--higher pitch lower frequency--lower pitch |
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know the doppler effect
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ok
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the effects of sound on the ear are loudness, pitch & quality. Loudness is an effect of _____
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Pitch
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Pitch is an effect of _______
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quality
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a difference in 10 dB means the sound is how much as loud
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twice as loud
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what is the formula to find r?
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r = sq rt. (P/4int.pi)
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what is the range of frequency of human hearing?
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20 to 20,000 Hz
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What is the speed of sound in air at 25 Celcius?
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vs, air = 346 m/s @ 25 C
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sound waves are produced by _________ objects
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vibrating
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define compression
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the region of a longitudinal wave in which the density & pressure are GREATER than normal
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define rarefaction
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the region of a longitudinal wave in which density & pressure are less than normal
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what are infrasonic waves
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frequency is less than 20 Hz
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what are ultra sonic waves
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frequency is greater than 20,000 Hz
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what is pitch
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the perceived highness/lowness of a sound
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what is frequency
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# of cycles per unit of time
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as temperature increases, velocity _________
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increases
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what is sound intensity
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the rate at which energy flows through a unit area perpendicular to wave motion
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energy moves equally in ___ directions
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all
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what does human hearing depend on
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frequency and intensity of the sound waves
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what is the threshold of hearing
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0 dB
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what is the threshold of pain
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120 dB
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