JEE Main 2021 (Online) 25th February Evening Shift | Communication Systems Question 69 | Physics

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 :

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

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

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

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

JEE Main 2021 (Online) 25th February Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

Given below are two statements :

Statement I : A speech signal of 2 kHz is used to modulate a carrier signal of 1 MHz. The bandwidth requirement for the signal is 4 kHz.

Statement II : The side band frequencies are 1002 kHz and 998 kHz.

In the light of the above statements, choose the correct answer from the options given below :

Statement I is false but Statement II is true

Both Statement I and Statement II are false

Statement I is true but Statement II is false

Both Statement I and Statement II are true

JEE Main 2020 (Online) 2nd September Morning Slot

MCQ (Single Correct Answer)

-1

Out of Syllabus

An amplitude modulated wave is represented by the expression
v_m = 5(1 + 0.6 cos 6280t) sin(211 × 10⁴ t) volts
The minimum and maximum amplitudes of the amplitude modulated wave are, respectively

$${3 \over 2}$$ V, 5 V

$${5 \over 2}$$ V, 8 V

5 V, 8 V

3 V, 5 V

JEE Main 2019 (Online) 12th April Evening Slot

MCQ (Single Correct Answer)

-1

Out of Syllabus

In an amplitude modulator circuit, the carrier wave is given by, C(t) = 4 sin(20000 $$\pi $$t) while modulating signal is given by, m(t) = 2 sin (2000 $$\pi $$t). The values of modulation index and lower side band frequency are :

0.3 and 9 kHz

0.5 and 10 kHz

0.4 and 10 kHz

0.5 and 9 kHz

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