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Which of the following statements is/are...

Which of the following statements is/are correct ?

A

Piezoelectric crystals are used as pick-ups in record players, they are also used in microphones, ultrasonic generators, and sonar detectors.

B

`BaTiO_(3)`, Rochelle salt and `KH_(2)PO_(4)` are ferroelectric and piezoelectric solids.

C

The temperature above which no ferromagnetism is observed is called curie temperature.

D

The temperature at which the material shows superconductivity is called transition temperature.

Text Solution

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The correct Answer is:
A, B, C, D
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