ADVT:  REFURBISHED MOBILES IN AMAZON     When a bell is struck, it vibrates with a certain frequency (Number of vibrations per second).  The vibrating bell pushes the air molecules around it.  Hence air pressure variations are created with the same frequency.  These pressure variations travel as a sound wave and reach our ears.  The ears sense it...

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kannan narayanan

blogs from Tiruchirappalli

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