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Model Paper 1 — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsModel Paper 11 Mark
MCQ
A wave of frequency 100 Hz travels along a string towards its fixed end. When this wave travels back, after reflection, a node is formed at a distance of 10 cm from the fixed end. The speed of the wave (incident and reflected) is
  • A
    $40 m / s$
  • B
    $10 m / s$
  • C
    $5 m / s$
  • D
    $20 m / s$
✓

Answer

(d) $20 m / s$
Explanation: Distance between two nodes, i.e.,
$\left(\frac{\lambda}{2}\right)=10$ or $\lambda=20 cm$
Now, $v = n \lambda=100 \times 20 cm / sec =20 m / sec$

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