Figure shows the displacement-time graphs of two simple harmonic mo...

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Figure shows the displacement-time graphs of two simple harmonic motions I and II. From the graph it follows that
(a) curve I has same frequency as that of curve II.
(b) curve I has frequency twice that of curve II.
(c) curve I has frequency half that of curve II.
(d) curve I has frequency four times that of curve II.
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