NCERT Physics Class 12 Exemplar Ch 15 Communication Systems Part 2 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Short Answer

Q 21 Figure shows a communication system. What is the output power when input signal is of ?

Figure Shows a Communication System

Ans:

Loss suffered in transmission path

Total amplifier gain

Overall gain of signal

Q 22 A TV transmission tower antenna is at a height of . How much service area can it cover if the receiving antenna is (i) at ground level, (ii) at a height of ? Calculate the percentage increase in area covered in case (ii) relative to case (i) .

Ans:

(i) Range

Area covered

ii) Range

Area covered

Percentage increase in area