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What is the minimum frequency at which a crystal will oscillate?

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What is the minimum frequency at which a crystal will oscillate?

(a) fundamental

(b) seventh harmonic

(c) second harmonic

(d) third harmonic

The question was asked in my homework.

Query is from Oscillators in portion Power Amplifiers of Electronic Devices & Circuits

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The correct answer is (a) fundamental

For explanation I would say: The physical size of the quartz crystal affects the final or fundamental frequency of oscillations. The fundamental frequency is generally called the crystals “characteristic frequency”. The crystals characteristic or characteristic frequency is inversely proportional to its physical thickness between the two metalized surfaces.

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