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A photosensitive material is at 9m to th...

A photosensitive material is at 9m to the left of the origin and the source of light is at 7 m to the right of the origin along x-axis.The photosensitive material and the source of light start from rest and move, respectively, with `8hatims^(-1)` and `4hatims^(-1)`. The ratio of intensities at `t=0` to `t-3 s` as received by the photosensitive material

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