A crystal microphone uses __________.
A. the piezoelectric effect
B. the Doppler effect
C. magnetic wavicles to operate
D. a permanent magnet for resonance
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Download Printable PDF. VALID exam to help you PASS. |
 |
A crystal microphone uses __________.
A. the piezoelectric effect
B. the Doppler effect
C. magnetic wavicles to operate
D. a permanent magnet for resonance
|
Download Printable PDF. VALID exam to help you PASS. |
|