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26 Cards in this Set
- Front
- Back
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Compression of air molecules: |
When they are really close together |
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Rarefaction of air molecules: |
When they are spread apart |
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Speed of sound in air |
Varies with humidity, temperature, wind |
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Dry still air |
speed= 330 m/s |
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Room temperature air |
around 340 m/s
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(If the speed of sound is constant) LONGER wavelengths will have ________________ |
Lower frequencies than shorter wavelengths |
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Sound waves can reflect: |
Bounce off smooth rigid surface Absorb by soft and irregular surface Refract (bend) if there is a difference in temperature or density of air |
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Loud spots are locations where... |
crests from both sources arrive at the same time |
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Dead spots are locations where... |
troughs from both sources arrive at the same time |
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Resonance: |
when windows shake |
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Beats: |
Destructive: when only one compression from a tuning fork meets in the same location Constructive: when both compression spots from a tuning fork meet in the same location |
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Music |
Pitch, loudness, and quality |
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Pitch: |
is frequency. |
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High pitch = |
high frequency |
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Low pitch = |
low frequency |
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Octave = |
a factor of 2 in frequency |
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We can hear from about... |
20 Hz - 18,000 Hz |
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Intensity: |
power per area (W/m2) |
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Threshold of hearing: |
10 ^-12 W/m2 |
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10 decibels = |
1 bel |
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0 bel = |
threshold of hearing |
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1 bel is |
10 x louder |
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2 bels is |
100 x louder |
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Tubes: |
Standing waves in pipes |
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2 ways to describe maxima |
Pressure and displacement |
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What property makes it possible to tell the difference between the same note played on a guitar and a piano? |
Wave shape |
