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Waves and Sound — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsWaves and Sound1 Mark
MCQ
The distance between two consecutive crests in a wave train produced in a string is $5 \mathrm{~cm}$. If $2$ complete waves pass through any point per second, the velocity of the wave is
  • ✓
    $10 \mathrm{~cm} / \mathrm{sec}$
  • B
    $2.5 \mathrm{~cm} / \mathrm{sec}$
  • C
    $5 \mathrm{~cm} / \mathrm{sec}$
  • D
    $15 \mathrm{~cm} / \mathrm{sec}$
✓

Answer

Correct option: A.
$10 \mathrm{~cm} / \mathrm{sec}$
(a) $v=n \lambda=2 \times 5=10 \mathrm{~cm} / \mathrm{sec}$

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