Loudness

Definition

Loudness is the perception of the strength or intensity of a sound. It is influenced by both the amplitude of the sound wave and the sensitivity of the human ear.

5 Must Know Facts For Your Next Test

1. Loudness is measured in decibels (dB), which quantify sound pressure level.
2. Human hearing ranges from approximately 0 dB, the threshold of hearing, to around 120-130 dB, where sounds become painfully loud.
3. The perceived loudness doubles with every increase of about 10 dB.
4. Frequency affects loudness perception; humans are more sensitive to frequencies between 2,000 and 5,000 Hz.
5. Loudness is subjective and can vary from person to person based on individual hearing capabilities.

Review Questions

Related terms

Decibel:

A logarithmic unit used to measure sound intensity. One decibel (dB) represents a power ratio of $10^{0.1}$.

Amplitude:

The height of a sound wave's crest, which determines its loudness.

Frequency:

The number of oscillations or cycles per second in a wave, measured in hertz (Hz), affecting pitch and perceived loudness.