Two elements P and Q have half lives of 10 and 15 minutes respectively. Freshly prepared samples of each isotope initial contain the same number of atoms as each other. After 30 minutes, the ratio of number of P atoms to number of Q atoms will be :

Options

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

Answer

A

Explanation

In 30 minutes, there will be 3half lives of P and2 half lives of Q.
`therefore` Numbre of P atoms will be 1/8 th 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