Frequencies in the Uhf Range Normally Propagate by Means Of: - Physics


Frequencies in the UHF range normally propagate by means of:

(a) Ground waves.

(b) Sky waves.

(c) Surface waves.

(d) Space waves.



(d) Answer:

Space waves

Owing to its high frequency, an ultra high frequency (UHF) wave can neither travel along the trajectory of the ground nor can it get reflected by the ionosphere. The signals having UHF are propagated through line-of-sight communication, which is nothing but space wave propagation.

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Chapter 15: Communication Systems - Exercise [Page 530]


NCERT Physics Class 12
Chapter 15 Communication Systems
Exercise | Q 2 | Page 530

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Which of the following frequencies will be suitable for beyond-the-horizon communication using sky waves?

(a) 10 kHz

(b) 10 MHz

(c) 1 GHz

(d) 1000 GHz

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(ii) Represent values as discrete steps,

(iii) Can utilize binary system, and

(iv) Can utilize decimal as well as binary systems.

Which of the above statements are true?

(a) (i) and (ii) only

(b) (ii) and (iii) only

(c) (i), (ii) and (iii) but not (iv)

(d) All of (i), (ii), (iii) and (iv).

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(a) Identify ‘X’ and ‘Y’.

(b) Write their functions.

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Write briefly any two factors which demonstrate the need for modulating a signal. Draw a suitable diagram to show amplitude modulation using a sinusoidal signal as the modulating signal.

What do you mean by bandwidth of a signal? Give its importance. 

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The audio frequency range is

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Would sky waves be suitable for transmission of TV signals of 60 MHz frequency?


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