" A banana contains about 420 mg of potassium, of which asmall fraction is the radioactive...
Homework Answers
The expression for the number of the radioactive nuclei in terms of material mass is,
Here, 
is atomic mass and 
is Avogadro number.
Substitute 420 mg for mass, 
for Avogadro number and 40 g/ mole for atomic mass in equation (2).
Thus, the required number of nuclei is
.
The expression for the activity in terms of initial number of nuclei is
Here, 
is initial number of nuclei and 
is half-life.
Substitute 
for number of nuclei and 
for half-life.
Therefore, the initial activity potassium-40 of the sample is
.
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" A banana contains about 420 mg of potassium, of which asmall fraction is the radioactive...
Reactivity and Decay A banana in your lunch contains 380 mg of potassium, of which a...
Reactivity and Decay
A banana in your lunch contains 380 mg of potassium, of which a small fraction is the radioactive isotope 40 19 K. Using the percentage of radioactive potassium to nonradioactive potassium in Appendix B, estimate the activity of this banana due to the radioactive 40 19 K. decays/s
The average banana contains 0.41 g of potassium and 0.012% of naturally occurring potassium is 40K,...
The average banana contains 0.41 g of potassium and 0.012% of naturally occurring potassium is 40K, which has a half-life of 1.248 x 10 years and an atomic mass of 39.964 u. What is the activity of a freshly picked pair of bananas? activity: Вq
The average banana contains 0.44 g of potassium and 0.012% of naturally occurring potassium is 40K,...
The average banana contains 0.44 g of potassium and 0.012% of naturally occurring potassium is 40K, which has a half-life of 1.248 x 10° years and an atomic mass of 39.964 u. What is the activity of a freshly picked bunch containing six bananas? activity: Вg
The average banana contains 0.40 g of potassium and 0.012% of naturally occurring potassium is 40K,...
The average banana contains 0.40 g of potassium and 0.012% of naturally occurring potassium is 40K, which has a half-life of 1.248 x 109 years and an atomic mass of 39.964 u. What is the activity of a freshly picked bunch containing three bananas? activity: Вq
The average banana contains 0.436 g of potassium, and 0.012% of naturally occurring potassium is 40K,...
The average banana contains 0.436 g of potassium, and 0.012% of naturally occurring potassium is 40K, which has a half-life of 1.248 × 10^9 years and an atomic mass of 39.964 u. What is the activity of a freshly picked bunch containing three bananas? The activity is the number of 40K decays that occur per unit time. Activity is commonly measured in units of Becquerel (Bq), which is defined as decays per second. Recall that the atomic mass unit u...
will rate. thanks 1.248 X 109 EXAM 13. A 75.0kg man typically contains about 300g of potassium in his body. Given th...
will rate. thanks
1.248 X 109 EXAM 13. A 75.0kg man typically contains about 300g of potassium in his body. Given that potassium-40 makes up 0.012% of any sample of potassium and the half-life of potassium-40 is 1.248 x 109 years, how many radioactive decays per year come from his body due to potassium-40? Laboratory 15 | Radioactivity of Potassium - 40 183
After the sudden release of radioactivity from the Chernobyl nuclear reactor accident in 1986, the radioactivity...
After the sudden release of radioactivity from the Chernobyl nuclear reactor accident in 1986, the radioactivity of milk in one region of Poland rose to 1450 Bq/L due to iodine-131 present in the grass eaten by dairy cattle. (Note that the radioactivity was higher in other regions of Poland.) Radioactive iodine, with half-life 8.04 days, is particularly hazardous because the thyroid gland concentrates iodine. The Chernobyl accident causeda measurable increase in thyroid cancers among children in Belarus. (a) For comparison,...
I am confused and need to see steps to understand (a) Natural potassium contains Ok, which...
I am
confused and need to see steps to understand
(a) Natural potassium contains Ok, which has a half-life of 1.277 x 10 y. What mass (ing) of "' in a person would have a decay rate of 4120 Bq? (b) What is the fraction of in natural potassium, given the person has 139 g in his body?
Which of the following is true about the filtrate of the glomerulus? A It contains little...
Which of the following is true about the filtrate of the glomerulus? A It contains little or no glucose B It contains little or no protein C It contains little or no sodium D It contains little or no urea E It contains little or no potassium
The following questions pertain to radioactive decay, which are first-order reactions. • Decay constant = rate...
The following questions pertain to radioactive decay, which are first-order reactions. • Decay constant = rate constant • Activity is the number of nuclei (N) decaying per unit time 1. a. What is the decay constant for the B emission of 3H given ty = 12.26 yr? b. What fraction of tritium atoms in a sample remains after 100.0 yr? c. If the original number of tritium atoms was 1.50 x 1018, what is the number remaining? and that a....
Reactivity and Decay
A banana in your lunch contains 380 mg of potassium, of which a small fraction is the radioactive isotope 40 19 K. Using the percentage of radioactive potassium to nonradioactive potassium in Appendix B, estimate the activity of this banana due to the radioactive 40 19 K. decays/s
The average banana contains 0.41 g of potassium and 0.012% of naturally occurring potassium is 40K, which has a half-life of 1.248 x 10 years and an atomic mass of 39.964 u. What is the activity of a freshly picked pair of bananas? activity: Вq
The average banana contains 0.44 g of potassium and 0.012% of naturally occurring potassium is 40K, which has a half-life of 1.248 x 10° years and an atomic mass of 39.964 u. What is the activity of a freshly picked bunch containing six bananas? activity: Вg
The average banana contains 0.40 g of potassium and 0.012% of naturally occurring potassium is 40K, which has a half-life of 1.248 x 109 years and an atomic mass of 39.964 u. What is the activity of a freshly picked bunch containing three bananas? activity: Вq
will rate. thanks
1.248 X 109 EXAM 13. A 75.0kg man typically contains about 300g of potassium in his body. Given that potassium-40 makes up 0.012% of any sample of potassium and the half-life of potassium-40 is 1.248 x 109 years, how many radioactive decays per year come from his body due to potassium-40? Laboratory 15 | Radioactivity of Potassium - 40 183
After the sudden release of radioactivity from the Chernobyl nuclear reactor accident in 1986, the radioactivity of milk in one region of Poland rose to 1450 Bq/L due to iodine-131 present in the grass eaten by dairy cattle. (Note that the radioactivity was higher in other regions of Poland.) Radioactive iodine, with half-life 8.04 days, is particularly hazardous because the thyroid gland concentrates iodine. The Chernobyl accident causeda measurable increase in thyroid cancers among children in Belarus. (a) For comparison,...
I am
confused and need to see steps to understand
(a) Natural potassium contains Ok, which has a half-life of 1.277 x 10 y. What mass (ing) of "' in a person would have a decay rate of 4120 Bq? (b) What is the fraction of in natural potassium, given the person has 139 g in his body?
The following questions pertain to radioactive decay, which are first-order reactions. • Decay constant = rate constant • Activity is the number of nuclei (N) decaying per unit time 1. a. What is the decay constant for the B emission of 3H given ty = 12.26 yr? b. What fraction of tritium atoms in a sample remains after 100.0 yr? c. If the original number of tritium atoms was 1.50 x 1018, what is the number remaining? and that a....
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