Physics - Wave on String Question with Solution | TestHub

The resultant intensity varies periodically with time and distance

The resultant intensity with $I_{min}/I_{max}={\left(\frac{a_1-a_2}{a_1+a_2}\right)}^2$ is obtained for coherent waves travelling in the same direction

Both the waves must have constant phase difference at any point all the time

$I_R=I_1+I_2+2\sqrt{I_1{I}_2}\text{cos}\Delta \varphi$, where constructive interference occurs for path differences that are odd multiples of $\lambda /2$ and destructive for even multiples of $\lambda /2$