Question 304: Atoms & Nuclei

Question

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

Accepted Answer

After every half-life, the mass of the substance reduces to half its initial value.
$${N_0}\mathop  	o \limits^{5\,years} \,\,{{{N_0}} \over 2}\mathop  	o \limits^{5\,years} {{{N_0}} \over {{2^2}}}\mathop  	o \limits^{5\,years} {{{N_0}} \over 8}$$

Answer

$${N_0}/8$$

Answer

$${N_0}/16$$

Answer

$${N_0}/2$$

Answer

$${N_0}/4$$

Atoms & Nuclei

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

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