Communication S...

In which of the following remote sensing technique is not used

For sky wave propagation of a 10 MHz signal, What should be the minimum electron density in ionosphere

What should be the maximum acceptance angle at the aircore interface of an optical fibre ifn₁ and n₂ are the refractive indices of the core and the cladding,respectively

IN He–Ne laser the most favorable ratio of helium to neon for satisfactory laser action is

For good demodulation of AM signal of carrier frequency f, the value of RC should be

Of the following which is preferred modulation scheme for digital communication

The SKIP ZONE in Radio Wave Transmission is that range where

The area of the region covered by the TV broadcast by a TV tower of 100 m height is (radius of the earth = 6.4 × 10⁶m)

The velocity of all radio waves in free space is 3 × 10⁸ m/s. The frequency of a radio wave of wavelength 150 m is

The sky wave propagation is suitable for radio-waves of frequency