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Which of the following effects can be used to produce ultrasonic waves?

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in Engineering Physics I by (558k points)
Which of the following effects can be used to produce ultrasonic waves?

(a) Magnetostriction effect

(b) Doppler Effect

(c) Magnetic effect

(d) Sound effect

I got this question in semester exam.

The question is from Magnetostriction Effect and Magnetostriction Generator topic in portion Ultrasonics & Relativity of Engineering Physics I

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The correct choice is (a) Magnetostriction effect

Easy explanation: When an alternating magnetic field is applied to a ferromagnetic material, then the rod is thrown into vibrations, thereby producing ultrasonic waves at resonance. Therefore ultrasonic waves can be produced using magnetostriction effect.

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