Following figure shows sources and
that emits light of wavelength
in all directions. The sources are exactly in phase and are separated by a distance equal to
. If we start at the indicated start point and travel along path 1 and 2 , the interference produce a maxima all along

Path 1
Path 2
Any path
None of these
At any point along the path 1 , path difference between the waves is 0 .
Hence maxima is obtained all along the path 1.
At any point along the path 2 , path difference is which is odd multiple of
so minima is obtained all along the path 2 .
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5 g of Na2SO4 was dissolved in x g of H2O. The change in freezing point was found to be 3.820C. If Na2SO4 is 81.5% ionised, the value of x (K

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