The half-life of Po-218 is 3.05 minutes. How many minutes does it take for a sample of Po-218 to decay to 2.35% of its initial value?

Please use the values in the resources listed below instead of the textbook values. A laboratory investigation shows that a sample of uranium ore contains 5.48 mg of 238 92 U and 2.66 mg of 82 206 pb. Calculate the age (in y) of the ore. (The half-life of 238 U is 4.47x109 y. The mass of a U atom is 238.050783 amu, and the mass of a 206 pb atom is 205.974449 amu.) 82 1.55e+09 Y 92 238 92 +

A particular radioactive element has a half-life of 63 days. What percent of the original sample is left after 189 days? Group of answer choices 12.5 % 75 % 33.33 % 50 % 25 %

a) Mrs. Price's son, Liam is currently working as a boilermaker at the Darlington Nuclear Power plant. He is working with Uranium-237 which has a half-life of 13.75 days. What mass of an initial sample of 567.5g of uranium-237 would remain after 56 days? b) Write the complete reaction for the decay of Po-210 if it undergoes 2 consecutive alpha decay followed by a beta decay followed by another alpha decay.

32 P is a radioactive isotope with a half-life of 14.3 days. If you currently have 41.9 g of P, how much 3P was present 7.00 days ago?

3.) The half-life of 14C is 5730 years. A sample contains 90.8 % of the 14C that it would contain if it were still part of a living being. What is the age (in years) of this sample?

Cesium-131 has a half-life of 9.7 days. What percent of a cesium-131 sample remains after 64 days? 62% 99 % 0 % 100 % 1.0 %

Sr-90 has a half-life of 28.8 years. Beginning with 15.0 of Sr-90, how much will remain after 145 years. g Sr

226 226 The decay constant, k, for Ra is 1.37 x 10-11 s-1. What mass of 88 Ra has an activity of 1.06 x 109 atoms/s? 88

The half life of Au-198 is 2.7 days. If a sample starts with 100 grams of Au-198, how many grams will be left after 45 days? Make sure to show enough work to justify your answer.