Propagation of Electromagnetic Waves in Atmosphere

Which mode of propagation is used by short wave broadcast services having frequency range from a few MHz upto 30 MHz?

State whether true or false.The frequency of sounding body of time period 0.01 seconds is 100Hz.

Frequency range used in downlinking in satellite communication is:-

Weather satellites are used to forecast weather, temperature, humidity corresponding to a region.

The navigation satellites provide _____ coordinates of the location.

What are the usage communication satellites.

Write a short note on Weather satellites.

What are the different types of artificial satellites on the basis of their application?

What should be the height of transmitting antenna and the population covered if the television telecast is to cover a radius of $150 \mathrm{km}?$  The average population density around the tower is $2000 {\mathrm{km}}^{-2}$ and the value of $R_{\mathrm{e}}=6.5\times {10}^6 \mathrm{m}.$

During ground wave propagation earth behaves like a _____.

A TV tower has a height of $200 \mathrm{m}$. How much population is covered by the TV broadcast if the average population density around the tower is $1200 \mathrm{k}{\mathrm{m}}^{-2}$ (radius of the earth$=6.37\times {10}^6$ m)

A TV tower has a height of 100 m. How much population is covered by the TV broadcast if the average population density around the tower is $100 \mathrm{k}{\mathrm{m}}^{-2}$ (radius of the earth$=6.37\times {10}^6$ m)

Ground waves are polarised in ______ direction.

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

Long range radio transmission is possible when the radiowaves are reflected from the ionosphere. For this to happen the frequency of the radiowaves must be in the range :

The electric field of an electromagnetic wave travelling through vacuum is given by the equation$E=E_0\sin (kx-\omega t)$. The quantity that is independent of wavelength is

The frequency range of $3 \mathrm{MHz}$to $30 \mathrm{MHz}$ is used for

Which type of communication is employed in mobile phones-

In space communication, the sound waves can be sent from one place to another

A TV tower has a height of 100 m. How much population is covered by the TV broadcast if the average population density around the tower is $1000 \mathrm{k}{\mathrm{m}}^{-2}$ (radius of the earth$=6.37\times {10}^6$ m)