Question

The half-life of ${}^{99}Tc$ is 6.0 h. Hence, average life is:

• A. 4.17 h
• B. 3.0 h
• C. 8.66 h
• D. 8.00 h

Answer 1

Answer: (C)

8.66 h

As we know,

Average life =$1.44t_{1/2}$

$t_{avg}=1.44t_{1/2}$

$=1.44\times 6$

$t_{avg}$ $=8.66h$

Hence,option C is correct.