Two elements `P` and `Q` have half-line of `10` and `15` minutes repectively. Freshly preapared sample of mixuture containing equal number of atoms is allowed to decay for `30` minutes. The ratio of number of atoms of `P` and `Q` in left in mixture is:

Options

A. 0.5
B. 2
C. 1
D. 3

Answer

a

Explanation

In 30 minutes, there will be 3 half lives of P and 2 half lives of Q
`:.` Number of P atoms will be 1/8th and number of Q atoms will be 1/4th of original atoms.
Then `("Number of atoms of P")/("Number of atoms of Q") = (1//8)/(1//4) = (1)/(2)`, i.e., 0.5