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Hur sker ECHO?

Cermin itu akan mengalir imej dan menghantar lampu kembali. Dinding juga menghantar suara kembali. Jika anda perlu berdiri agak farther dari tembok yang tinggi atau dalam Gaung besar, anda akan mendengar suara anda berputar kembali beberapa minit kemudian.

Jika gelombang bunyi pertemuan dinding atau permukaan rock yang tinggi dan luas, ia putar ke belakang ke arah sumbernya. Itulah bagaimana echo yang berlaku. Jika bunyi diekstrak adalah pendek dan gelombang bunyi sampai ke bateri seperti biasa, echo yang mendengar dengan jelas. Kesan bunyi yang kekal di telinga untuk 1/10 saat.

Oleh kerana kelajuan bunyi di udara adalah 340 meter sesaat, jarak di antara sumber audio dan bateri supaya echo untuk mestilah sekurang-kurangnya 17 meter. ...

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