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Bagaimana gema terjadi?

Cermin akan mengalir gambar dan mengirim cahaya kembali. Dinding juga mengirim suara kembali. Jika Anda berdiri agak jauh dari tembok tinggi atau tebing besar, Anda akan mendengar suara Anda berputar kembali beberapa detik kemudian.

Jika gelombang suara pertemuan dinding atau permukaan batu tinggi dan lebar, ia berputar ke belakang ke arah sumbernya. Itulah bagaimana echo terjadi. Jika suara diekstrak pendek dan gelombang suara mencapai baterai seperti biasa, echo dapat didengar jelas. Jejak suara tetap di telinga selama 1/10 detik.

Karena kecepatan suara di udara adalah 340 meter per detik, jarak antara sumber audio dan baterai menjadi gema harus setidaknya 17 meter.

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