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112 solutions

First Order Half Life

Q. Neutron activation analysis for a sample of a rock revealed the presence of 131-I, which has a half-life of 8.08 days. Assuming the isotope was freshly separated from its decay products, what is the mass of 131-I in a sample emitting 1.00 mCi of radiation? Express your answer in grams to three significant figures.

Solved • Mar 17, 2020

First Order Half Life

Q. In the parts that follow, use the following abbreviations for time You are using a Geiger counter to measure the activity of a radioactive substance over the course of several minutes. If the reading of 400. counts has diminished to 100. counts after 72.1 minutes, what is the half-life of this substance? Express your answer with the appropriate units.

Solved • Mar 16, 2020

First Order Half Life

Q. In the parts that follow, use the following abbreviations for time minutes min hours h days d years yr A fossil was analyzed and determined to have a carbon-14 level that is 70% that of living organisms. The half-life of C-14 is 5730 years. How old is the fossil? Express your answer with the appropriate units.

Solved • Mar 16, 2020

First Order Half Life

Q. The half-life phosphorus-32 is 14.26 days. Calculate its decay constant. Express the decay constant numerically in inverse days.

Solved • Mar 16, 2020

First Order Half Life

Q. Phosphorus-32 decays by beta emission to form sulfur-32. How many half0lives have passed in the reaction shown here? (Figure 1) Express your answer as an integer.

Solved • Mar 15, 2020

First Order Half Life

Q. In the parts that follow, use the following abbreviations for time minutes min hours h days d years yr You are using a Geiger counter to measure the activity of a radioactive substance over the course of several minutes. If the reading of 400. counts has diminished to 100. counts after 89.3 minutes, what is the half-life of this substance? Express your answer with the appropriate units.

Solved • Mar 15, 2020

First Order Half Life

Q. Consider the reaction: A → B. Use the below data to determine the first half-life for experiment 1. Please answer in seconds. Experiment [A] Initial Rate [M/s] 1 0.1 M 0.0025 2 0.2 M 0.01

Solved • Apr 2, 2020