Acoustics Formulas
Acoustics formulas covering sound intensity, decibels, frequency, wavelength, Doppler effect, reverberation time, and wave behavior.
Decibel Addition Formula
Learn how to add decibel levels from multiple sound sources. Calculate combined dB using logarithmic addition with worked examples.
Acoustic Impedance Formula
Understand acoustic impedance (Z = ρv). Includes specific acoustic impedance, reflection and transmission coefficients, and practical examples.
Helmholtz Resonance Formula
Calculate the resonant frequency of a Helmholtz resonator cavity. Used in bass reflex speakers, wine bottles, and acoustic design.
Standing Wave Formula
Learn the standing wave formula for strings and open/closed pipes. Includes frequency equations, harmonics table, and worked examples.
Reverberation Time Calculator — Sabine's RT60 Formula
Calculate RT60 reverberation time using Sabine's formula. Enter room volume and total absorption area to find T60 for studio and concert hall acoustic design.
Sound Transmission Loss Formula
Calculate how much sound a wall or barrier blocks using the mass law TL = 20 log(f m) - 47. Essential for soundproofing and building design.
Sound Wavelength Formula
Calculate the wavelength of sound using λ = v/f. Understand the relationship between pitch, frequency, and physical wavelength.
Decibel Formula
Reference for dB = 10 log10(I/I0) and dB = 20 log10(P/P0). Covers intensity, pressure, and power ratios with a table from 0 dB (hearing) to 140 dB (jet).
Doppler Effect Formula
Reference for the Doppler effect f' = f(v+vo)/(v-vs). Calculate frequency shift for moving sources and observers with examples for sirens and ultrasound.
Resonant Frequency Formula
Reference for resonant frequency formulas for strings f = (1/2L)sqrt(T/μ) and air columns. Covers string tension, harmonics, and instrument design applications.
Sound Intensity Formula
Reference for I = P / (4πr²) and the inverse square law. Calculate how sound spreads with distance in dB with examples for speakers and noise levels.
Speed of Sound Formula
Reference for v = 331.3 + 0.606T m/s speed of sound in air. Calculate sound speed at any temperature and compare to water, steel, and other media.