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Q.

In the Young's double slit experiment, the ratio of intensities of bright and dark fringes is 9. This means that

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a

The intensities of individual sources are 5 and 4 units respectively

b

The intensities of individual sources are 4 and 1 units respectively

c

The ratio of their amplitudes is 3

d

The ratio of their amplitudes is 4

answer is B.

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Detailed Solution

ImaxImin=9​⇒a1+a2a1−a22=9​⇒a1+a2a1−a2=3​⇒a1a2=3+13−1​⇒a1a2=2. ​Therefore I1:I2=4:1
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