Question

The half life period of a radioactive element is 140 days. After 560 days 1 g of element reduced to:

• A. ( (1)/(8) ) g
• B. ( (1)/(2) ) g
• C. ( (1)/(16) ) g
• D. ( (1)/(4) ) g

Hint:

You can also solve this by simple division: Start: 1 g 1ˢᵗ 0.5 g 2ⁿᵈ 0.25 g 3ʳᵈ 0.125 g 4ᵗh 0.0625 g (which is 1/16 g).

Answer 1

The Correct Option is C