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When is ultrasonic waves produced using piezo electric oscillator?

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in Engineering Physics I by (558k points)
When is ultrasonic waves produced using piezo electric oscillator?

(a) At constant temperature

(b) At resonance

(c) At constant pressure

(d) At constant voltage

This question was posed to me in unit test.

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

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Best answer
The correct choice is (b) At resonance

The best explanation: Piezo electric oscillators produce ultrasonic waves at resonance. That is when the frequency of the oscillatory circuit is equal to the frequency of the vibrating crystal.

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