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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