Sound as a longitudinal wave3 formulas
Displacement and pressure waves
= displacement, = bulk modulus. is out of phase with : largest where .
Nodes at the ends of a pipe
Closed end is a pressure antinode; open end a displacement antinode.
Echo
Ear holds a sound about 0.1 s. Audible 20 Hz – 20 kHz.
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17 more formulas in 5 topics
Speed of sound, Intensity and loudness, Organ pipes and resonance tube, Beats and Doppler effect (off syllabus from 2024). Read the first part free. Sign in free with Google to read the rest and download the PDF.
Speed of sound4 formulas
- Newton's formula
- Laplace correction3×
- Temperature, pressure, humidity
- Solids and liquids1×
Intensity and loudness4 formulas
- Intensity of a sound wave
- Point source1×
- Sound level
- Pitch, loudness, quality
Organ pipes and resonance tube4 formulas
- Open pipe1×
- Closed pipe2×
- End correction1×
- Resonance tube4×
Beats3 formulas
- Beat frequency7×
- Finding an unknown frequency2×
- Forks in a row
Doppler effect (off syllabus from 2024)2 formulas
- Doppler effect18×
- Echo from a wall you approach
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