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Waves — Physics STD 11 — Question

Tamilnadu BoardEnglish MediumSTD 11PhysicsWaves1 Mark
MCQ
Two waves represented by the following equation are travelling in the same medium: y1 = 5 sin 2π (75t – 0.25 x) and y2 = 10 sin 2π (150 – 0.25x) The intensity ratio of the two waves is ……..
  • A
     1 : 2
  • ✓
     1 : 4
  • C
    $1: 8$
  • D
    $1: 16$
✓

Answer

Correct option: B.
 1 : 4
$1: 4$
Hint :
$I \propto A^2 \Rightarrow \frac{I_1}{I_2}=\left(\frac{A_1}{A_2}\right)^2=\left(\frac{5}{10}\right)^2=\frac{1}{4}$

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