Question

1

..If sound waves of frequency 20 KHz are
to be transmitted directly, then the length
of the antenna required is​

Answer 1

Answer:

For transmitting a signal, we need an antenna or an aerial. This antenna should have a size comparable to the wavelength of the signal (at least 1/4 in dimension) so that the antenna properly senses the time variation of the signal. For an electromagnetic wave of frequency 20 kHz, the wavelength λ is 15 km.

Answer 2

Answer:

Explanation:

:

λ=cf=3×10820×103=15×103 m = 15 km

∴ the required length of the antenna =λ2=7.5 km