Q. 14

Two coherent sour A. 25 : 1

B. 5 : 1

C. 9 : 4

D. 625 : 1

Answer :

Let the amplitude of two sources be and .


Now for maximum intensity, the resultant amplitude is


And for minimum intensity, the resultant amplitude is


and intensities are proportional to the amplitudes. Therefore, the maximum amplitude is



and minimum amplitude is


let


Now, the ratio of intensities is




solving this, we get . Hence, option (c) is the current answer.

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