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(C) The resultant amplitude $A$ of two interfering waves with amplitudes $A_1$ and $A_2$ and a phase difference $\Delta \phi$ is given by the formula:

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on both the above

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(C) The resultant amplitude $A$ of two interfering waves with amplitudes $A_1$ and $A_2$ and a phase difference $\Delta \phi$ is given by the formula:$A = \sqrt{A_1^2 + A_2^2 + 2A_1A_2 \cos \Delta \phi}$From this expression,it is clear that the resultant amplitude $A$ depends on both the individual amplitudes $(A_1, A_2)$ and the phase difference $\Delta \phi$ between the two coherent sources.Therefore,the correct option is $C$.

The resultant amplitude in interference with two coherent sources depends upon:

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