Tag: artificial satellite

What fraction of the surface area of earth can be covered to establish communication by one geostationary satellite?

A ground receiver station is receiving a signal at (a) 5 MHz and (b) 100MHz, transmitted from a ground transmitter at a height of 400m located at a distance of 125km. Identify whether it is coming via space wave or sky wave propagation or satellite transponder. Radius of earth = $6.4\times { 10 }^{ 6 }m$; maximum number density of electrons in ionosphere = ${ 10 }^{ 12 }{ m }^{ -3 }$ 

For satellite communication which wave is used?

State whether the given statement is True or False :

As the height of a satellite orbit gets lower, the speed of the satellite _________.

Let $R _s$ and $R _m$ be the distance of the geostationary satellite and moon from the center of earth. Then $\dfrac{R _m}{R _s}$ is

If the satellite is stopped sudden;y in its orbit which is at a distance radius of earth from earth's surface and allowed to fall freely into the earth. the speed with which it hits the surface of earth will be:

A remote -sensing satellite of earth revolves in a circular orbit at a height of $ 0.25 \times 10^6 $ m above the surface of earth. if earth's radius is $ 0.25 \times 10^6 $ m above the surface of earth. if earth's radius is $ 6.38 \times 10^6 m $ and $ g= 9.8 m/s^2 $, then the orbital speed of the satellite is :

What kind of battery used by older satellites?

State the chronological order in which the following events took place.
$1$. Launching of APPLE
$2$. Launching of Rohini
$3$. Antarctica expectation
$4$. Indian cosmonaut