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The transverse displacement of a string ...

The transverse displacement of a string clamped at its both ends is given by
`y(x,t)=2sin((2pi)/3x)cos(100pit)`
where x and y are in cm and t is in s.
Which of the following statements is correct?

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The correct Answer is:
All the points except the nodes on the string have the same frequency and phase, but not the same amplitude.
(b) `0.042 m`
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