A radar has a power of 10 kW and is operating at a frequency of 20 GHz. If islocated on the top of a hill of height 500m.Calculate the maximum distance upto which it can detect object located on the surface of the earth ? `R = 6.4 xx 10^6`m.

A radar has a power of 1 kW and is operating at a frequency of 10 GHz it is located on a mountain top of height 500 m The maximum distance upto which it can detect object located on the surface of the earth (Radius of earth = 6.4 xx 10^(6) m ) is

The height of a T.V. tower is 300 m. What is the maximum distance upto which T. V. signals can be received ? ( R = 6400 km)

Name the type of waves which are used for line of sight (LOS) communication. What is the range of their frequencies? A transmitting antenna at the top of a tower has a height of 20m and the height of the receiving antenna is 45m. Calculate the maximum distance between them for satisfactory communication in LOS mode. (Radius of the Earth = 6.4 xx 10^(6) m)

A transmitting antenna at the top of a tower has a height 32m and that of the receiving antenna is 50m. What is the maximum distance between then for satisfactory communication in line of sight made ? R = 6.4 xx 10^6 m

Derive an expression for critical velocity of satellite. Calculate the acceleration due to gravity at a height of 300 km from the surface of the earth. M = 6xx10^24kg R = 6400 km.

Solve the following examples / numerical problems: Find the magnitude of the acceleration due to gravity at the surface of the earth. ( M= 6xx 10^24 kg, R= 6400 km)