1
JEE Main 2021 (Online) 25th July Morning Shift
+4
-1
In amplitude modulation, the message signal

Vm(t) = 10 sin (2$$\pi$$ $$\times$$ 105t) volts and

Carrier signal

VC(t) = 20 sin(2$$\pi$$ $$\times$$ 107 t) volts

The modulated signal now contains the message signal with lower side band and upper side band frequency, therefore the bandwidth of modulated signal is $$\alpha$$ kHz. The value of $$\alpha$$ is :
A
200 kHz
B
50 kHz
C
100 kHz
D
0
2
JEE Main 2021 (Online) 22th July Evening Shift
+4
-1
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 Re = 6.5 $$\times$$ 106 m.
A
Height = 1241 m

Population covered = 7 $$\times$$ 105
B
Height = 1731 m

Population covered = 1413 $$\times$$ 105
C
Height = 1800 m

Population covered = 1413 $$\times$$ 108
D
Height = 1600 m

Population covered = 2 $$\times$$ 105
3
JEE Main 2021 (Online) 17th March Evening Shift
+4
-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?
A
50 MHz
B
8 GHz
C
1987.5 MHz
D
2.01 GHz
4
JEE Main 2021 (Online) 16th March Morning Shift
+4
-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 :
A
200
B
400
C
100
D
300
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