Question

Q2,3
2. Half-life period of a certain radioactive sample is 138 days. Express it in seconds.
3.Express a joule, the SI unit of energy, in terms of fundamental units.

Answer 1

Dear Student ,
$$\begin{gathered} 2.138days=138\times 24hours==138\times 24\times 3600seconds=1,19,23,200seconds. \\ 3.joule=N-m=Kg·m^2/s^2 \end{gathered}$$

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