Sound & Acoustics
A few examples of what you can ask Wolfram|Alpha about:
Doppler Shift
compute a Doppler shift
Subjective Acoustics
compute perceived loudness
compute source loudness
Sound Absorption
find the absorption coefficient of sea water
determine the effect of distance on sound pressure levels in moist air
Helmholtz Resonator Frequency
determine resonant frequency of a cavity
Threshold Hearing Distance in Moist Air
find the maximum distance for hearing a sound
generate sound with a specified waveform
specify a waveform as a mathematical function