Question

Select the correct answer.The half-life of hellum-s is 7.6 x 10-22 seconds, and the half-life of hellum-9 is 7 x 10-21 seconds. Approximately how many times greater is thehalf-life of hellum-9 than that of hellum-5?ОА2 timesОВ.7 timesОс.9 timesOD. 11 times

Answer 1

Answer:

9 times

Explanations:
`\text{Half life of Helium-5 = 7.6 }*10^(-22)\text{ seconds}`
`\text{Half life of Helium-9 = 7 x 10}^(-21)\text{ seconds }`

The number of times that the half life of Helium-9 is greater than that of Helium-5 is calculated as:

`\begin{gathered} \frac{\text{ 7 x 10}^(-21)}{\text{ 7.6 }*10^(-22)} \\ 0.92\text{ }*\text{ 10 }=\text{ 9}.2 \end{gathered}`

9.2 can be approximated to 9

Therefore, the half life of Helium-9 is 9 times greater than the half life of Helium-5