Sound and its related terms

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.
AmplitudeThe measure of intensity of a sound wave determines its volume or loudness. Greater amplitude means a louder sound.
EchoThe 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.
FrequencyThe 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.
HertzSI unit of frequency, 1 hertz (1Hz) = 1 vibration per second.
LarynxSound producing organ (voice box) in humans.
LoudnessThe degree of sensation of sound depends on the frequency of sound.
PitchCharacterized of sound depending on the frequency of sound.
SONARA technique used to determine the depth of the sea and locate underwater objects.
TimberThe characteristics of sound that help us to distinguish between two sounds of the same loudness.  
VacuumAbsence of all material particles
VibrationHigh-frequency oscillations.
HarmonyThe 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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