loudness, It is how soft or how intense the sound is as perceived by the ear., ultrasonic, These are sound waves with frequency beyond 20 000 Hz that cannot perceived by human ear, sound wave, These are mechanical waves that need a medium to be propagated., music, It is a special sound thar forms and are appealing to our sense of hearing., vibration, It is created by a series of compression and rarefaction which result in longitudinal waves., sound intensity, It refers to the amount of energy a sound wave carries, decibel, It is the standard unit of sound., noise, It is a distorted sound which is not pleasing to the ears., pitch, It refers to the highness and lowness of sound, sonic frequency, These are the sound waves within the 20 Hz-20, 000 Hz range which can be perceived by the human ear.

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