Assertion (A) : Audio signal of frequency 10 kHz cannot be transmitted over long distance without modulation.
Reason (R) : Length of the antenna required \(\frac{\lambda}{4}\).
Answer & explanation
Correct answer: option 1
The length of antenna required for this transmission will be :
\(\lambda\) = \(\frac{c}{\nu}\)
c = 3 x 108 m/s ; \(\nu\) = 10 x 103 Hz
The length of antenna required for this transmission : l = \(\frac{\lambda}{4}\) = 7500 m