JEE Main 2021 (Online) 22th July Evening Shift | Communication Systems Question 44 | 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) 17th March Evening Shift

MCQ (Single Correct Answer)

-1

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 Morning Shift

MCQ (Single Correct Answer)

-1

A 25 m long antenna is mounted on an antenna tower. The height of the antenna tower is 75 m. The wavelength (in meter) of the signal transmitted by this antenna would be :

200

400

100

300

JEE Main 2021 (Online) 25th February Evening Shift

MCQ (Single Correct Answer)

-1

English

Hindi

If a message signal of frequency 'f_m' is amplitude modulated with a carrier signal of frequency 'f_c' and radiated through an antenna, the wavelength of the corresponding signal in air is :

$${c \over {{f_c} + {f_m}}}$$

$${c \over {{f_c}}}$$

$${c \over {{f_c} - {f_m}}}$$

$${c \over {{f_m}}}$$

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