Which of the following statement is//are correct?

Options

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, `KH_(2)PO_(4)`, and quartz are ferroelectric and piezoelectric solids.
C. The temperature above which no ferromagnetism is observed is called curie termperature.
D. The temperature at which the material shows super-conductivity is called transition termperature.

Answer

A, B, C, D

Explanation

(a, b, c, d) All fectual statements.