Wave has simple harmonic motion whose period is $4\; sec$ while another wave which also possesses simple harmonic motion has its period $3\; sec$. If both are combined, then the resultant wave will have the period equal to ....... $sec$
AIPMT 1993, Medium
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Beats are produced. Frequency of beats will be $\frac{1}{3}-\frac{1}{4}=\frac{1}{12}$ Hence time period $=12 s$
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