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A device that converts sound energy into electrical energy is

A. the horn of a motor car

B. the telephone earpiece

C. a loudspeaker

D. a microphone.

QUICK ANSWER…

D

DETAILS…

When we speak into a microphone, it detects the air vibrations around and converts the energy of these vibrations into electrical impulses that can be amplified and sent to loudspeakers to reconvert back into a louder sound.

So, a microphone converts sound energy from your mouth into electrical energy, and a loudspeaker or earpiece reconverts the electrical impulse back to sound.

Now for the right answer to the above question:

1. Option A is incorrect. the horn of a motor car converts electrical energy to sound energy.
2. Option B is incorrect. a telephone earpiece converts electrical impulses to sound energy.
3. C is incorrect. a loudspeaker also converts electrical energy to sound energy.
4. D is the correct answer. a microphone converts sound energy into electrical impulses.

KEY-POINTS…

You may please note these/this:

• Microphones and mouthpieces of phones are good examples of devices that converts sound energy into electrical energy.
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/ culled from 2015 JAMB-UTME physics past question 7 /