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14. waves and sound — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics14. waves and sound1 Mark
MCQ
Two sinusoidal waves with same wavelengths and amplitudes travel in opposite directions along a string with a speed $10 ms^{-1}$. If the minimum time interval between two instants when the string is flat is $0.5\, s$, the wavelength of the waves is .... $m$
  • A
    $25$
  • B
    $20$
  • C
    $15 $
  • ✓
    $10 $
✓

Answer

Correct option: D.
$10 $
d
(d) Minimum time interval between two instants when the string is flat

= $\frac{T}{2} = 0.5\sec \Rightarrow T = 1\sec $

Hence $\lambda = v \times T = 10 \times 1 = 10\,m$.

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