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Decibel Walk

Walk away from a speaker and watch the meter fall. Add sounds in decibels.

Physics · Class 11 · Loudness and decibels · 6 simulations. For JEE, NEET and your boards.

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What you'll learn

  1. Walk back: Intensity falls as 1/r²
  2. Pressure swing: Intensity from the pressure swing: I = p₀² / 2ρv
  3. Cone swing: Intensity from the displacement swing: I = ½ρvω²s₀²
  4. The dB meter: Decibels: β = 10 log(I / I₀)
  5. Double the swing: Amplitude × n: the level rises by 20 log n
  6. Two machines: Add intensities, not decibels