Question

If a radioactive element having half-life of 30 min. is undergoing beta decay, the fraction of radioactive element remains undecayed after 90 min. will be

• A. $\frac{1}{8}$
• B. $\frac{1}{4}$
• C. $\frac{1}{16}$
• D. $\frac{1}{2}$

Answer 1

Answer: (A)

$\frac{1}{8}$

Answer 2

The correct answer is 1/8