Question

A signal wave of frequency 12 kHz is modulated with a carrier wave of frequency 2.51 MHz. The upper and lower side band frequencies are respectively

• A. 2512 kHz and 2508 kHz
• B. 2522 kHz and 2488 kHz
• C. 2502 kHz and 2498 kHz
• D. 2522 kHz and 2498 kHz

Answer 1

Answer: (D)

2522 kHz and 2498 kHz

Answer 2

: Here $\upsilon_{s} = 12kHz,\upsilon_{c} = 2.51MHz = 2510kHz$

The upper side band frequency $= 2510 + 12 = 2522kHz$

The lower side band frequency $= 2510 - 12 = 2498kHz$