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Two radioactive elements A and B are present in a mixture. Both are beta active. Half lives of A and B are 30 minute and 60 minute respectively. The initial activity of the sample hour only 30 beta particles were detected in an interval of 2 second. Assume that law of radioactivity decay is obeyed. (a) Find the ratio of number of active of A to that of B in the mixture initially. (b) The molar mass of both A and B is closed to 200g. The mixture contains other substance (non radioactive) aprt from A and B. what fraction of the entire mixure is radioactive (fraction by weight) if it is given what mass of the mixture is 1mug .

In the circuit shown all live resistors have the same volue 200 oms and each cell has an emf 3 volts. Find the open circuit voltage and the short circuit current for the terminals A and B.