Question

why ultrasonic frequencies are greater than 3 MHZ cannot be produced by magnetosrtiction method?​

Answer 1

In magnetostriction method, the frequency is inversely proportional to the length of the rod. The frequency can be increased only by decreasing the length of the rod to a greater extent, which is practically impossible. ... Hence, ultrasonic frequencies greater than 3MHZ cannot be produced by magnetostriction method.

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