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String Fixed at Both Ends

The amplitude...

Question

The amplitude of the two travelling waves that make up this standing wave is $2.80 \times 10^{- x} m$ . Find $x$ .

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Solution

The amplitude of the resultant wave is double of that of the constituent superimposed waves.
Thus $2 A_{i} = A_{f} = 5.60 c m$
$⟹ A_{i} = 2.80 c m = 2.80 * 10^{- 3} c m$

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