Electronics Engineering Question:

What is Transponder? Give the difference between Transducer and Transponder?

Transducer is a sensor while transponder is an amplifier.

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How to measure frequency without CRO?	In a binary data sequence, the duration of symbol 0 or 1 is 1ms. If a carrier of freq 4khz is used in ASK, What is the minimum transmission bandwidth required? What is min bandwidth?