Question

Crystal microphones work based on:

• A. Electromagnetic induction
• B. Piezoelectric effect
• C. Resistance change
• D. Capacitance change

Hint:

Piezoelectric crystals generate voltage when mechanically stressed, making them useful in microphones and sensors.

Answer 1

The Correct Option is B

Crystal microphones operate based on the piezoelectric effect. In these microphones, certain crystals (such as quartz or Rochelle salt) generate an electric voltage when mechanical pressure or vibrations are applied to them. When sound waves strike the diaphragm of the microphone, it causes pressure changes on the crystal, producing an electrical signal proportional to the sound. This property makes crystal microphones sensitive and suitable for specific applications like telephones and some recording devices. Unlike dynamic microphones which use electromagnetic induction, crystal microphones rely on the direct conversion of mechanical stress into electrical energy through the piezoelectric effect.