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What kind of resistances do sound waves face while traveling in a medium such that their velocity does not exceed 332m/ sec? What are the losses of using plastic electric kettle for tea? How to convert metres into square metres? Can we theoretically determine aggradation zones of a river given slopes alone? do we have to determine a certain constant experimentally? The sum of n yerms of two arithmetic series are in the ratio 2n+1:2n-1 ,find the ratio of their nth and 10th terms .?