Q67 / 90 · JEE Main 2019 (09 Apr Shift 1) · Physics

A signal Acosωt is transmitted using ν0sinω0t as carrier wave. The correct amplitude modulated (AM) signal is:

  • A
    ν0sin⁡[ω01+0.01Asinωtt]
  • B
    ν0+Acosωt sinω0t
  • C
    ν0 sinω0t+Acosωt
  • Correct answer
    D
    ν0sinω0t+A2sin⁡ω0-ωt+A2sin⁡ω0+ωt

Solution

ym=A cosωt
yc=V0 sinω0t
Modulated signal =V0+A cosωtsinω0t
=V0sinω0t+Acosωt sinω0t
=V0sinω0t+A2sinω0-ωt+A2sinω0+ωt

Hence, the correct answer is option: 'D'.

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