2076 B / 2075 S / 2069 A
Find the half-life of $U^{238}$, if one gram of it emits $1.24 * 10^4$ $\alpha - particles$ per second. (Avogadro's Number = $6.023 * 10^{23}$). [Click here for Solution]
2074 A
The isotopes $Ra-226$ undergoes $\alpha$ decay with a half-life of $1620$ years. What is the activity of $1\;g$ of $Ra-226$? Avogadro number = $6.023 * 10^{23}\; /mole$. [Click here for Solution]
2074 B
Calculate the mass in grams of a radioactive sample $Pb-214$ having an activity of $3.7 * 10^4$ decays/s and a half-life $26.8$ minutes. Avogadro number = $6.023 * 10^{23}\; /mole$. [Click here for Solution]
2073 S / 2056
A radioactive source has decayed to one-tenth of one percent of its initial activity in one hundred days. What is its half-life period? [Click here for Solution]
2073 C
Half-life of $Ra^{226}$ is $1620$ years. Estimate its mass hen its activity is $0.5$ Curie. [Click here for Solution]
2072 C
After a certain lapse of time, the fraction of radioactive polonium undecayed is found to be $12.5\%$ of the initial quantity. What is the duration of this time-lapse if the half-life of polonium is $139$ days? [Click here for Solution]
2071 S
If $15 \%$ of the radioactive material decays in $5$ days, what would be the percentage of the amount of original material left after $25$ days? [Click here for Solution]
Find the half-life of $U^{238}$, if one gram of it emits $1.24 * 10^4$ $\alpha - particles$ per second. (Avogadro's Number = $6.023 * 10^{23}$). [Click here for Solution]
2074 A
The isotopes $Ra-226$ undergoes $\alpha$ decay with a half-life of $1620$ years. What is the activity of $1\;g$ of $Ra-226$? Avogadro number = $6.023 * 10^{23}\; /mole$. [Click here for Solution]
2074 B
Calculate the mass in grams of a radioactive sample $Pb-214$ having an activity of $3.7 * 10^4$ decays/s and a half-life $26.8$ minutes. Avogadro number = $6.023 * 10^{23}\; /mole$. [Click here for Solution]
2073 S / 2056
A radioactive source has decayed to one-tenth of one percent of its initial activity in one hundred days. What is its half-life period? [Click here for Solution]
2073 C
Half-life of $Ra^{226}$ is $1620$ years. Estimate its mass hen its activity is $0.5$ Curie. [Click here for Solution]
2072 C
After a certain lapse of time, the fraction of radioactive polonium undecayed is found to be $12.5\%$ of the initial quantity. What is the duration of this time-lapse if the half-life of polonium is $139$ days? [Click here for Solution]
2071 S
If $15 \%$ of the radioactive material decays in $5$ days, what would be the percentage of the amount of original material left after $25$ days? [Click here for Solution]
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