A device that converts sound energy into electrical energy is?
A
the horn of a motor car
B
an A.C. generator
C
a microphone
D
the telephone
E
radio waves
Verified Correct Answer: C.
Physical Principles & Numerical Solution
The dynamic microphone is constructed with a small magnet that oscillates inside a coil attached to the diaphragm.
When a sound wave causes the diaphragm of the microphone to vibrate, the relative motion of the magnet and coil creates an electrical signal by magnetic induction.
Source: WAEC / JAMB / NECO Classroom Archive (Record #28735)