Examples for

# Sound & Acoustics

Acoustics is the study of mechanical waves in gases, liquids and solids, extending to all forms of sound. Wolfram|Alpha includes many computations and equations for determining how sound is affected by motion, humidity and distance as well as the listener's perceived experience.

### Doppler Shift

Calculate how Doppler shift changes the frequency of sound waves.

#### Compute a Doppler shift:

### Sound Absorption

Explore acoustic sound barriers and absorption properties of water and air.

#### Find the absorption coefficient of seawater:

#### Determine the effect of distance on sound pressure levels in moist air:

### Hearing-Loss Exposure Time

Calculate how soon hearing is lost due to exposure to noise.

#### Compute exposure time to avoid hearing loss:

### Subjective Acoustics

Compute the subjective loudness and perceptual acoustical scale values of a sound.

#### Compute perceived loudness:

#### Compute source loudness:

#### Convert frequencies to different perceptual acoustical scales:

### Helmholtz Resonator Frequency

Determine the resonant frequencies of Helmholtz resonators based on their physical dimensions.

#### Determine resonant frequency of a cavity:

Play and visualize sound waves constructed from different waveforms.

#### Generate sound with a specified waveform:

#### Specify a waveform as a mathematical function:

### RELATED EXAMPLES

### RELATED WOLFRAM RESOURCES

### Threshold Hearing Distance in Moist Air

Calculate the hearing threshold for a sound based on ambient conditions.