Terms used in sound

Decibel (dB)	The unit of measure loudness level of sound. It’s a logarithmic scale where a small change in decibel level represents a large change in sound intensity. For example, a whisper might measure around 20 dB, while a rock concert can exceed 120 dB.
Amplitude	The measure of intensity of a sound wave determines its volume or loudness. Greater amplitude means a louder sound.
Echo	The reflection of sound waves off a surface, results in a repetition of the sound after a delay. It occurs when sound waves bounce off a surface and return to the listener.
Frequency	The number of cycles of a sound wave that occur per second is measured in Hertz (Hz). Higher frequency corresponds to higher pitch, while lower frequency relates to lower pitch.
Hertz	SI unit of frequency, 1 hertz (1Hz) = 1 vibration per second.
Larynx	Sound-producing organ (voice box) in humans.
Loudness	The degree of sensation of sound depends on the frequency of sound.
Pitch	Characterized of sound depending on the frequency of sound.
SONAR	A technique used to determine the depth of the sea and locate underwater objects.
Timber	The characteristics of sound that help us to distinguish between two sounds of the same loudness.
Vacuum	Absence of all material particles
Vibration	High-frequency oscillations.
Harmony	The combination of different musical notes played or sung simultaneously to create a pleasing sound. Harmony adds depth and richness to music.

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