Fill in the following blanks with suitable words (a) An echo is simply a ................... sound.
(b) Pitch of sound depends on ....................
(c) Loudness of sound depends on .....................
(d) Quality of sound depends on ........................
(e) Echoes are caused by the ...................... of sound.
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reflecting, audible or inaudible, amplitude , pitch , reflection , hope it will help you
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