Question

A radio isotope ‘X’ with a half life 1.4 × 10⁹ years decays to ‘Y’ which is stable. A sample of the rock from a cave was found to contain ‘X’ and ‘Y’ in the ratio 1 : 7. The age of the rock is:(a) 1.96 × 10⁹ years(b) 3.92 × 10⁹ years(c) 4.20 × 10⁹ years(d) 8.40 × 10⁹ years

Answer 1

$<b>$

Option A is Correct

Answer 2

Heya mate!!

Option (A) is correct.