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Electronics and Communication Engineering - Communication Systems - Discussion

Discussion Forum : Communication Systems - Section 4 (Q.No. 17)
Communication Systems
17.
A 300 Hz sound wave of intensity 20 dB is transmitted by a 1500 kHz radio wave by frequency modulation. It is seen that instantaneous frequency varies between 1500.2 kHz and 1499.8 kHz, 300 times a second. If the intensity of sound wave is 100 dB.
The instantaneous frequency variations will be between 1500.2 and 1499.8 kHz, 1500 times a second
The instantaneous frequency variations will be between 1501 and 1499 kHz, 1500 times a second
The instantaneous frequency variations will be between 1501 and 1499 kHz, 300 times a second
The instantaneous frequency variations will be between 1501 and 1499 kHz, 60 times a second
Answer: Option
Explanation:

Since, the intensity of audio wave has been increased five times, the instantaneous frequency variation is also increased five times.

Discussion:
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