Question

The decay constant of a radioactive element is 0.01 per second. Its half life period is.

• A. 693 sec
• B. 6.93 sec
• C. 0.693 sec
• D. 69.3 sec

Answer 1

Answer: (D)

69.3 sec

Answer 2

$t_{1/2} = \frac{0.6931}{0.01} = 69.31$seconds.