Which of the follow ing techniques use piezoelectric crystals?: (A) Ultrasonography, (B) X-ray diffraction, (C) NMR imaging, (D) Xeroradiography
Answer is A. Ans. is 'a' i.e.. Ultrasonography {Ref: Sutton 6th/e p. 12: Grainger 4th/ep. 102]o Ultrasonography is based on piezoelectric effect.o MR! is based on gyeromagnetic property of proton (H+).