In a sky wave propagation, the maximum frequency transmitted is `27 MH z`. If the ion density is `y times 10^(12) / m^3`, then find `y`.

The critcal frequency for sky wave propagation if maximum number density of electrons in ionosphere is 10^(3) m_(-3) is

If the critical frequency for sky wave propagation is 12 MHz , then the maximum electron density in the ionosphere is

What is meant by critical frequency for sky wave propagation? Write an expression for the critical frequency interms of the maximum electorn density of the ionosphere. What is the range of variation of frequency for this critical frequency?

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

What is the value of frequency at which an e.m. wave must be propagated for the D - region to have a refractive index of 0.49 ? Electron density for D-layer is 10^(9) m^(-3) .

In an electromagnetic wave, the amplitude of magnetic field is 3xx10^(-10)T . If the frequency of the waves is 10^(12)Hz , then the amplitude of the associated electrical field will be :-

In an electromagnetic wave, the amplitude of electric field is 10 V/m. The frequency of wave is 5 x10^(14) Hz, the wave is propagating along z–axis, then total average energy density of E.M. wave is