`I=(P)/(4pi r^(2))`
At a large distance r from a radio antenna, the intensity of the radio signal I is related to the power of the signal P by the formula above.
Which of the following expresses the square of the distance from the radio antenna in terms of the intensity of the radio signal and the power of the signal?

I=(P)/(4pi r^(2)) At a large distance r from a radio antenna, the intensity of the radio signal I is related to the power of the signal P by the formula above. For the same signal emitted by a radio antenna, Observer A measures its intensity to be 16 times the intensity measured by Observer B. The distance of Observer A from the radio antenna is what fraction of the distance of Observer B from the radio antenna?

If lambda is wavelength of radio signals to be transmitted, then the length of Hertz antenna is

If lambda is wavelength of radio signals to be transmitted, then the length of Hertz antenna is

What is the minimum length of antenna required to transmit a radio signal of frequency 20 MHz?

Find the minimum length of antenna used to transmit a radio signal of frequency of 30 MHz.

Find the minimum length of antenna used to transmit a radio signal of frequency of 30 MHz.

The process of separating radio signal from the modulated wave is known as