Question

Rn decays into Po by emitting an \( \alpha \)-particle with half-life of 4 days. A sample contains \( 6.4 \times 10^{10} \) atoms of Rn after 12 days, the number of atoms of Rn left in the sample will be:

• A. \( 3.2 \times 10^{10} \)
• B. \( 0.53 \times 10^{10} \)
• C. \( 2.1 \times 10^{10} \)
• D. \( 0.8 \times 10^{10} \)

Hint:

The number of atoms left after a certain time can be calculated using the half-life formula, which involves the exponential decay of the substance.

Answer 1

The Correct Option is D