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Approximate how many times odd and even fields of television system are scanned?

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Approximate how many times odd and even fields of television system are scanned?

(a) 25 times each

(b) 50 times each

(c) 50 times each but alternately

(d) 25 times each but alternately

I have been asked this question by my college professor while I was bunking the class.

My question is based upon Modulation Using Non-Linear Devices (Balanced Modulator) topic in chapter Amplitude Modulation of Analog Communications

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Correct option is (d) 25 times each but alternately

Easiest explanation: In television system in India, each of odd and even fields are scanned 25 times but alternately.

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