imortant point on sound
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it is produced because of vibration.
sound needs a medium to travel.medium can be solid liquid or gas.
sound travels fastest in solids and slowest in gases.
sound can't travel through vacuum .
there are 3 characteristics of sound-pitch ,loudness.,quality.
two types. of sounds - audible and inaudible sounds.
the sound whose frequency lies between 20hz to. 20000hz are audible sounds.
sounds whose frequency is less than 20hz is inaudible sound.
note:Hz means Hertz