Q3 of 11 Page 144

Answer the following question:

What is meant by an artificial satellite? How are the satellites classified based on their functions?

A manmade object revolves around the earth or any other planet in a fixed orbit is called an artificial satellite.


Based on their function satellites are of various types-


a. Weather satellite- Study and prediction of weather.


b. Communication satellite – Establish communication between different location of the world.


c. Broadcast satellite – Telecasting of tv programmes.


d. Navigational satellite – Fix the location of any place on the earth’s surface.


e. Military satellite – Collect information for security aspects.


f. Earth observation satellite – Study of forests, deserts, oceans, polar ice etc.


More from this chapter

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1

Fill in the blanks and explain the statements with reasoning:

a. If the height of the orbit of a satellite from the earth surface is increased, the tangential velocity of the satellite will …


b. The initial velocity (during launching) of the Mangalyaan, must be greater than …………..of the earth.

 2

State with reasons whether the following sentences are true or false

a. If a spacecraft has to be sent away from the influence of earth’s gravitational field, its velocity must be less than the escape velocity.


b. The escape velocity on the moon is less than that on the earth.


c. A satellite needs a specific velocity to revolve in a specific orbit.


d. If the height of the orbit of a satellite increases, its velocity must also increase.

 3

Answer the following question:

What is meant by the orbit of a satellite? On what basis and how are the orbits of artificial satellites classified?

 3

Answer the following question:

Why are geostationary satellites not useful for studies of polar regions?