If ${N_0}$ is the original mass of the substance of half life period ${T_{1/2}} = 5$ years, then the amount of substance left after $15$ years is
If ${N_0}$ is the original mass of the substance of half life period ${T_{1/2}} = 5$ years, then the amount of substance left after $15$ years is
- [AIEEE 2002]
- A
${N_0}/8$
- B
${N_0}/16$
- C
${N_0}/2$
- D
${N_0}/4$
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