JEE Main 2023 (Online) 10th April Evening Shift | Communication Systems Question 7 | Physics

A message signal of frequency $$3 ~\mathrm{kHz}$$ is used to modulate a carrier signal of frequency $$1.5 ~\mathrm{MHz}$$. The bandwidth of the amplitude modulated wave is

$$6 ~\mathrm{MHz}$$

$$6 ~\mathrm{kHz}$$

$$3 ~\mathrm{MHz}$$

$$3 ~\mathrm{kHz}$$

JEE Main 2023 (Online) 10th April Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

A carrier wave of amplitude 15 V is modulated by a sinusoidal base band signal of magnitude 3 V. The ratio of maximum amplitude to minimum amplitude in an amplitude modulated wave is

$$\frac{3}{2}$$

JEE Main 2023 (Online) 8th April Evening Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

The power radiated from a linear antenna of length $$l$$ is proportional to

(Given, $$\lambda=$$ Wavelength of wave):

$$\left(\frac{l}{\lambda}\right)^{2}$$

$$\frac{l}{\lambda^{2}}$$

$$\frac{l^{2}}{\lambda}$$

$$\frac{l}{\lambda}$$

JEE Main 2023 (Online) 8th April Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

A TV transmitting antenna is $$98 \mathrm{~m}$$ high and the receiving antenna is at the ground level. If the radius of the earth is $$6400 \mathrm{~km}$$, the surface area covered by the transmitting antenna is approximately:

$$4868 \mathrm{~km}^{2}$$

$$1240 \mathrm{~km}^{2}$$

$$3942 \mathrm{~km}^{2}$$

$$1549 \mathrm{~km}^{2}$$

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