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Satellites Around the Earth

Dish in telev...

Question

Dish in television set receives signals from a satellite moving far above in space.

A

True

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B

False

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Solution

The correct option is A True

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Q. The diagram shows a dish antenna which is used to receive television signals from a satellite. The antenna (signal detector) is fixed in front of the curved dish.
Figure

(a) What is the purpose of the dish?
(b) Should it be concave or convex?
(c) Where should the antenna be positioned to receive the strongest possible signals?
(d) Explain what change you would expect in the signals if a larger dish was used.

Q. Consider the following statements:
1.In a direct-to-home (DTH) system, the viewers' dish antenna picks up signals from the satellite directly.
2.Cable operators receive signal from the satellite on large community dish antennas and then transmit to viewers' sets.
Which of the above statements is/are correct?

Q. Assertion: It is necessary to use satellites for long distance T.V transmission
Reason : The television signals are low frequency signals

Q. How does the concave mirror used in satellite dishes strengthen weak signals?

Q. If the radius of earth is R and height of a satellite above earth's surface is R then find the minimum co-latitude (in degree) which can directly receive a signal from satellite.

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