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Communication — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysicsCommunication1 Mark
MCQ
An amplitude modulated wave is represented by the expression $v_{m}=5(1+0.6 \cos 6280 t) \sin \left(211 \times 10^{4} t \right)\; volts$. The minimum and maximum amplitudes of the amplitude modulated wave are, respectively
  • A
    $5 \;V , 8\; V$
  • B
    $\frac{3}{2}\; V , 5 \;V$
  • ✓
    $\frac{5}{2} \;V , 8\; V$
  • D
    $3 \;V , 5\; V$
✓

Answer

Correct option: C.
$\frac{5}{2} \;V , 8\; V$
c
$V _{ m }=5(1+0.6 cos 6280 t ) \sin \left(2 \pi \times 10^{4} t \right)$

$V _{ m }=[5+3 cos 6820 t ] \sin \left(2 \pi \times 10^{4} t \right)$

$V _{\max }=5+3=8$

$V _{\min }=5-3=2$

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