JEE Main 2021 (Online) 22th July Evening Shift | Communication Systems Question 59 | Physics

What should be the height of transmitting antenna and the population covered if the television telecast is to cover a radius of 150 km? The average population density around the tower is 2000/km² and the value of R_e = 6.5 $$\times$$ 10⁶ m.

Height = 1241 m

Population covered = 7 $$\times$$ 10⁵

Height = 1731 m

Population covered = 1413 $$\times$$ 10⁵

Height = 1800 m

Population covered = 1413 $$\times$$ 10⁸

Height = 1600 m

Population covered = 2 $$\times$$ 10⁵

JEE Main 2021 (Online) 18th March Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

Match List - I with List - II.

List - I

(a) 10 km height over earth's surface

(b) 70 km height over earth's surface

(c) 180 km height over earth's surface

(d) 270 km height over earth's surface

List - II

(i) Thermosphere

(ii) Mesosphere

(iii) Stratosphere

(iv) Troposphere

(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)

(a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)

(a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)

(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)

JEE Main 2021 (Online) 17th March Evening Shift

MCQ (Single Correct Answer)

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Out of Syllabus

A carrier signal C(t) = 25 sin(2.512 $$\times$$ 10¹⁰t) is amplitude modulated by a message signal m(t) = 5 sin(1.57 $$\times$$ 10⁸t) and transmitted through an antenna. What will be the bandwidth of the modulated signal?

50 MHz

8 GHz

1987.5 MHz

2.01 GHz

JEE Main 2021 (Online) 16th March Evening Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

Two identical antennas mounted on identical towers are separated from each other by a distance of 45 km. What should nearly be the minimum height of receiving antenna to receive the signals in line of sight? (Assume radius of earth is 6400 km)

158.2 m

79.1 m

19.77 m

39.55 m

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