Question

Question No. 4
The performance of crystal
microphone is limited in hot countries
because
Answer
A.
The piezo-electric property increases
at low temperatures
B. The piezo-electric property
decreases at high temperatures
C. The piezo-electric property increases
at high temperatures
D. It has wide frequency response
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Answer 1

Answer:

C

Explanation:

I think it is correct answer

Answer 2

The correct answer is option (C.) The piezo-electric property increases

at high temperatures.

Explanation:

• The performance of crystal  microphone is limited in hot countries  because the piezo-electric property increases  at high temperatures.
• The deformation of the crystal on application of pressure which causes charge separation within the crystal is the cause of the piezoelectric effect.
• Conventional piezoelectric sensing has been applied widely in sensing of vibration, pressure, mass, distance, chemical and bio-sensing, but its operation temperature is usually below 700 °C.
• Recent development on high-temperature piezoelectric sensing suggests piezoelectric sensing at temperatures close to 1,000 °C.