7. What changes an electric signal back into a voice? A. A wire. B. A plastic disc. C. A telephone. D. A mouthpiece.
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Jawaban:
D. A mouthpiece.
In a telephone, an electric signal is converted back into a voice through the use of a mouthpiece or microphone. The mouthpiece captures the sound waves (voice) and transforms them into an electrical signal that can be transmitted through the communication network.