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

Gujarat BoardEnglish MediumSTD 11 SciencePhysics14. waves and sound1 Mark
MCQ
$A$ steel wire is used to stretch a spring. An oscillating magnetic field drives the steel wire up and down. $A$ standing wave with three antinodes is created when the spring is stretched by $4.0\, cm$. What stretch of the spring produces a standing wave with two antinodes with same frequency ... $cm$ ?
  • A
    $4$
  • B
    $12$
  • ✓
    $9$
  • D
    $6$
✓

Answer

Correct option: C.
$9$
c
$\frac{3}{{2l}}\sqrt {\frac{{k{x_1}}}{\mu }\,}  = \frac{2}{{2l}}\,\sqrt {\frac{{k{x_2}}}{\mu }\,}$

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