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30 solutions

First Order Half Life

Q. Enter your answer in the provided box. The isotope given below has a half-life of 1.01 yr. What mass (in mg) of a 2.00—mg sample will remain after 3.75 x 10^3 h? 212 Bi 83 __ mg

Solved • Aug 5, 2019

First Order Half Life

Q. Be sure to answer all parts. If 2.2 x 10^-10% of the atoms of a radioactive isotope disintegrate in 1.0 yr, what is the decay constant of the process? Enter your answer in scientific notation. __ X 10__ yr -1

Solved • Aug 5, 2019

First Order Half Life

Q. Enter your answer in the provided boa. A fabric remnant from a burial site has a 14C/12C ratio of 0.708 of the original value. How old is the fabric? __yr

Solved • Aug 5, 2019

First Order Half Life

Q. A rock contains 0.275 mg of lead-206 for each milligram of uranium-238, The half-life for the decay of uranium-238 to lead-206 is 4.5 x 10*9 yr. The rock was formed_________yr ago. 1.42 x 10*9 9.62 x 10*8 1.24 x 10*9 1.79 x 10*9 1.39 x 10*9

Solved • Jul 31, 2019

First Order Half Life

Q. Cesium-137 undergoes beta decay and has a half-life of 30.0 years. How many beta particles are emitted by a 14,0-g sample of cesium-137 in three minutes? 6.1 x 10*13 6.2 x 10*22 8.4 x 10*15 1.3 x 10*-8 8,1 x 10*15

Solved • Jul 31, 2019

First Order Half Life

Q. What is the half-life (in y) for the first-order decay of hydrogen-3? 3H1 2 3 He + e- The rate constant for the decay is 5.62 x10-2 year-1

Solved • Jul 1, 2019

First Order Half Life

Q. Carbon-14, which is present in all living tissue, radioactively decays via a first-order process. A one-gram sample of wood taken from a living tree gives a rate for carbon-14 decay of 13.6 counts per minute. If the half-life for carbon-14 is 5720 years, how old is a wood sample that gives a rate for carbon-14 decay of 3.9 counts per minute?

Solved • Jun 27, 2019