TELEPHONES

(1) What if you want to talk right no...

Question

TELEPHONES

(1) What if you want to talk right now to a friend who lives far away? The answer is simple. You pick up your telephone and press some buttons. Next, you hear a ringing sound-one, two, three rings. Then you hear your friend's voice say, "Hello". Making a phone call seems so easy. But did you ever think about what makes it possible? 
(2) When you talk on the phone, your voice is changed into an electric signal that can travel through wires. A plastic disk in the mouthpiece vibrates when you speak. The vibration makes a pattern in an electric field between the plastic disk and a metal disk. The pattern is sent through wires as an electric signal. Just as a telephone can turn a voice into an electric signal, it can also change an electric signal back into a voice. When the signals pass through magnets in the earpiece, the magnets vibrate a disk that reproduces the speaker's voice. 
(3) When you make a local call, the call travels over wires from your house to the telephone company's routing station. From there, a computer automatically sends the call to the number you dialed.

What changes an electric signal back into a voice?
A. a plastic disc
B. a telephone
C. a wire
D. a metal disc
E. a mouthpiece​

A. Imroatul · Accepted Answer

Answer: A. a plastic disk

Soal menanyakan tentang 'What changes an electric signal back into a voice?' yang artinya apa yang merubah sinyal elektrik menjadi suara?.

Terlihat pada teks di paragraf 2 kalimat pertama yaitu "..., your voice is changed into an electric signal that can travel through wires". Kalimat tersebut menyatakan " ... electric signal that can travel through wires" bahwa sinyal elektrik bergerak melalui perantara kabel, bukan merubah menajdi suara.
Kalimat selanjutnya yaitu "A plastic disk in the mouthpiece vibrates when you speak. The vibration makes a pattern in an electric field between the plastic disk and a metal disk.
The pattern is sent through wires as an electric signal." yang artinya piringan plastik yang terdapat pada bagian mulut tempat mikrofon bergetar saat kita berbicara. Getaran  membuat pola dalam medan listrik antara piringan plastik dan piringan logam. Pola gelombang tersebut dikirim melalui kabel sebagai sinyal elektrik. Dari kalimat tersebut didapat bahwa piringan plastik yang merubah sinyal elektrik menjadi getaran suara.

Jadi, jawabannya adalah a plastic disk. Oleh karena itu, opsi jawaban yang benar adalah A.

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