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Physics
Consider interference between two coherent sorces of intensities I and 4 I. Find the intensity at a point wherethe phase difference is (a) / 2 and (b) .
Chemistry
Multiple- Choice Question When vapours of 2-propanol is passed over hot metallic Cu at 570 K , the product formed is (A) 1 -propanol (B) propanone (C) propanol (D) propene
Mathematics
If the vectors a, b and c form the side BC, CA and AB respectively of a triangle ABC , then (a) a . b + b .c + c .a = 0 (b) a x b = b x c = c x a (c) a. b = b .c = c.a (d) a x b + b x c + c x a = 0

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