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Which layer is known as Appleton layer?

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Important Questions on Communication Systems

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Achieve CUET (UG) Physics Practice Book>Chapter 15 - Communication Systems>Exercise>Q 1
If the transmitting antenna is at hT height, then the distance of the horizon dT is given as :
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Achieve CUET (UG) Physics Practice Book>Chapter 15 - Communication Systems>Exercise>Q 2
What should be the minimum size of the transmitting antenna?
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Achieve CUET (UG) Physics Practice Book>Chapter 15 - Communication Systems>Exercise>Q 3
An antenna uses electromagnetic waves of frequency 5 MHz. For proper working, the size of the antenna should be
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Achieve CUET (UG) Physics Practice Book>Chapter 15 - Communication Systems>Exercise>Q 4
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=6.4×106 m) is:
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Achieve CUET (UG) Physics Practice Book>Chapter 15 - Communication Systems>Exercise>Q 5
The physical sizes of the transmitter and receiver antenna in a communication system are:
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Achieve CUET (UG) Physics Practice Book>Chapter 15 - Communication Systems>Exercise>Q 6
If a carrier wave of 1000 kHz is used to carry the signal, minimum the length of transmitting antenna will be equal to -
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Achieve CUET (UG) Physics Practice Book>Chapter 15 - Communication Systems>Exercise>Q 7
The distance of coverage of a transmitting antenna is 12.8 km. Then, the height of the antenna is (given that radius of the earth=6400 km),
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Achieve CUET (UG) Physics Practice Book>Chapter 15 - Communication Systems>Exercise>Q 8
The radius of the Earth is 6400 km. If the height of an antenna is 500 m, then its range is