Resource Lessons Labs Worksheets Textbook Assignments Textbook Resources
Diagrams: 26.2, 26.3, 26.4, 26.5, 26.6, 26.9, 26.10, 26.11, 26.13, 26.14, 26.16
In-Text Questions: pg 393 and 399
NextTime Questions Vocabulary
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wave
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vw = fλ
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mechanical
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non-mechanical
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longitudinal
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radio waves vs sound waves
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damped
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heat
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compression
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rarefaction
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amplitude (pressure/density)
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point source
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frequency (f)
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hertz
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kilohertz
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megahertz
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vibration
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period (T)
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equilibrium position
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wavelength (λ)
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relationship between frequency and wavelength
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relationship between frequency and period
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human range of frequencies
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infrasonic
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ultrasonic
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intensity, decibels
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interference
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beats
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beat pitch
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beat frequency
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constructive
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destructive
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antinodes (A)
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nodes (N)
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loops
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resonance
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forced vibration
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natural frequency
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properties of open pipes
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properties of closed pipes
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harmonics
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overtones
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standing waveform for an open water column
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reflection
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echo
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reverberation
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speed of sound (dry air)
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speed of sound increases with the medium's
rigidity, temperature, humidity
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Formulas
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vw = fλ
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d = rt |
| sound level |
dB to power
take the difference in the decibels, divide that difference by 10,
relationship between the original sound levels equals 10x power
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| beats |
beat frequency = |f2 - f1|
beat pitch = ½(f1 + f2)
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| speed of sound in dry air |
vw = 331 + 0.6T
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| open-closed pipe |
for the fundamental, A-N
Lpipe = ½ loop = ¼λ
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| open-open pipe |
for the fundamental, A-N-A
Lpipe = 1 loop = ½λ
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