KVPY Government Jobs Exams

At time t = 0, a container has N0 radioactive atoms with a decay constant λ. In addition, c numbers of atoms
of the same type are being added to the container per unit time. How many atoms of this type are there at
t = T

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KVPY Other Question

Two identical particles of mass 'm' and charge q are shot at each other from a very great distance with an
initial speed v. The distance of closest approach of these charges is 2.52 g of oxalic acid dehydrate was dissolved in 100 ml of water, 10 mL of this solution was diluted to 500
mL. The normality of the final solution and the amount of oxalic acid (mg/mL) in the solution are
respectively-
(A) 0.16 N, 5.04 (B) 0.08 N, 3.60 (C) 0.04 N, 3.60 (D) 0.02 N, 10.08