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Frequency of a Wave

Which of the ...

Question

Which of the following is incorrect?

A

Our headphones are a kind of transducer

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B

Loss of strength of a signal while propagation is called attenuation

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C

Original low frequency message can be tranmitted to long distance

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D

Noise refers to unwanted signals that tend to disturb transmission

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Solution

The correct option is C Original low frequency message can be tranmitted to long distance
Original low frequency message cannot be tranmitted to long distance, because the losses are too much during the transmission. Hence we modulate it into higher frequency carrier and send it.

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Q. Assertion(A): To transmit low frequency audio signals over long distances, the audio signals are superimposed on a high frequency carrier signal.
Reason(R): Low frequency audio signals cannot be transmitted directly over long distances.

Q. Messages are transmitted over a communication channel using two signals. The transmission of one signal requires 1 microsecond and the transmission of the other signal requires two microseconds. The recurrence relation for the number of different messages consisting of sequences of these two signals (where each signal is immediate followed by the next signal) that can be send in n microseconds

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S_{1} :

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S_{2} :

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