$A$ 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 ... $cm$ ?
Diffcult
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$\frac{3}{{2l}}\sqrt {\frac{{k{x_1}}}{\mu }\,} = \frac{2}{{2l}}\,\sqrt {\frac{{k{x_2}}}{\mu }\,}$
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