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14. I (d) 2:1 Four independent waves are...

14. I (d) 2:1 Four independent waves are expressed as (i) Y = a, sin wt (iii) yz = a, cos ot and The interference is possible between (a) (i) and (ii) (b) (i) and (iv) (ii) yz ='a, sin 2wt (iv) ya = a, sin (@t+ 7/3) (c) (ii) and (iv) (d) not

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