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What is the frequency range for a headphone as a detector?

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What is the frequency range for a headphone as a detector?

(a) 20 Hz to 20 kHz

(b) 10 kHz to 1 MHz

(c) 10 MHz to 1 GHz

(d) 250 Hz to 4 kHz

The question was posed to me in an interview.

My doubt is from Introduction to AC Bridges topic in portion Measurement of Inductance and Capacitance of Electrical Measurements

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The correct option is (d) 250 Hz to 4 kHz

Easiest explanation: Headphones can be used as detectors in AC bridges in the low audio frequency range. Low audio frequency range varies from 250 Hz to 4 KHz.

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