Sound, Doppler & Ultrasound
Sound intensity and decibels, the Doppler effect, ultrasound, and shock waves
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Sound, Doppler & Ultrasound
Sound Intensity
Intensity falls with the square of distance from a point source. Sound level is logarithmic: so each 10 dB step is a tenfold change in intensity.
Doppler and Ultrasound
Approach raises the observed frequency and recession lowers it. Ultrasound finds depth from echo timing, , and Doppler ultrasound measures blood speed from the frequency shift. A source faster than sound piles its wavefronts into a shock wave.
Key Takeaways
- +10 dB means 10 times the intensity.
- Relative approach raises pitch.
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Sound intensity and decibels, the Doppler effect, ultrasound, and shock waves
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