Sound
- It is a type of energy that travels through the air as a longitudinal wave, characterized by its frequency, wavelength, and amplitude.
Measurement of Sound:
- Sound Intensity: Sound intensity is defined as the power of sound per unit area, measured in watts per square meter (W/m^2). The sound intensity of a source decreases with increasing distance from the source.
- Decibel (dB): Decibels are a logarithmic unit used to express the intensity of a sound relative to a reference level. Decibels are calculated as:
dB = 10 log (I/I0)
Where:
- dB is the sound level in decibels
- I is the intensity of the sound
- I0 is the reference level of sound intensity