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A photographic plate placed at a distance of 5 cm from a weak point source is exposed for 3 s.

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A photographic plate placed at a distance of 5 cm from a weak point source is exposed for 3 s. If the plate is kept at a distance of 10 cm from the source, the time needed for the same exposure is

(a) 3 s

(b) 12 s

(c) 24 s

(d) 48 s.

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The correct answer is
(b) 12 s
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