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

Gujarat BoardEnglish MediumSTD 11 SciencePhysics14. waves and sound1 Mark
MCQ
The length of a sonometer wire tuned to a frequency of $250 Hz$ is $0.60$ metre. The frequency of tuning fork with which the vibrating wire will be in tune when the length is made $0.40$ metre is .... $Hz$
  • A
    $250$
  • ✓
    $375$
  • C
    $256 $
  • D
    $384$
✓

Answer

Correct option: B.
$375$
b
(b) ${n_1}{l_1} = {n_2}{l_2} \Rightarrow 250 \times 0.6 = {n_2} \times 0.4 \Rightarrow {n_2} = 375$

$ \Rightarrow {n_2} = 375\,Hz$

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