Calculate the half-lifetime t1/2 of a 20 kilogram radioactive material if on the 50th year, its...

Calculate the half-lifetime t1/2 of a 20 kilogram radioactive material if on the 50th year, its amount becomes 15 kilogram. Sketch the instantaneous amount of material up to infinity. using a differential equation.

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Manojponduru answered 2 years ago

What is the half-life (T1/2) of a radioactive element with the following conditions? -Initial Activity =...

What is the half-life (T1/2) of a radioactive element with the following conditions? -Initial Activity = 1000 milliCuries -Final Activity = 400 milliCuries -Elapsed Time= 20.0 days

Half-life equation for first-order reactions: t1/2=0.693k where t1/2 is the half-life in seconds (s), and k...

Half-life equation for first-order reactions: t1/2=0.693k where t1/2 is the half-life in seconds (s), and k is the rate constant in inverse seconds (s−1). A. What is the half-life of a first-order reaction with a rate constant of 5.60×10−4 s−1? B. What is the rate constant of a first-order reaction that takes 150 seconds for the reactant concentration to drop to half of its initial value? C. A certain first-order reaction has a rate constant of 7.20×10−3 s−1. How long...

The half-life of a reaction, t1/2, is the time required for one-half of a reactant to...

The half-life of a reaction, t1/2, is the time required for one-half of a reactant to be consumed. It is the time during which the amount of reactant or its concentration decreases to one-half of its initial value.Determine the half-life for the reaction in Part B using the integrated rate law, given that the initial concentration is 1.95 mol⋅L−1 and the rate constant is 0.0019 mol⋅L−1⋅s−1

Cobalt- 60 is radioactive and has a half life of 5.26 years. Calculate the activity of...

Cobalt- 60 is radioactive and has a half life of 5.26 years. Calculate the activity of a 8.3mg sample of cobalt- 60 . Give your answer in becquerels and in curies. Be sure your answer has the correct number of significant digits.

The quantity of a radioactive material is often measured by its activity (measured in curies or...

The quantity of a radioactive material is often measured by its activity (measured in curies or millicuries) rather than by its mass. In a brain scan procedure, a 84.0−kg patient is injected with 19.0 mCi of 99mTc, which decays by emitting γ−ray photons with a half-life of 6.01 h. Given that the RBE of these photons is 0.98 and exactly two-thirds of the photons are absorbed by the body, calculate the rem dose received by the patient. Assume all the...

Exposure over a number of weeks to 20 MeV alpha particles will make a material radioactive....

Exposure over a number of weeks to 20 MeV alpha particles will make a material radioactive. True or False?

1. If drug X has a half-life (T1/2) of 2 days (48 hours) and the concentration...

1. If drug X has a half-life (T1/2) of 2 days (48 hours) and the concentration at 12:00 today was 10 μg/mL, what would the expected concentration of drug X be at 12:00 tomorrow? a. 7 μg/mL b. 7.5 μg/mL c. 5 μg/mL d. 3.5 μg/mL 2. If a drug is administered orally, which of the following would affect the efficiency of its absorption in the gastrointestinal tract? a. Dissociation of the drug from its administered form b. The drug's...

Suppose a radioactive nucleus has a half-life of 2 min. and suppose the counting rate at...

Suppose a radioactive nucleus has a half-life of 2 min. and suppose the counting rate at time t = 0 is 3000 counts/10 sec. a. What is the counting rate after 2 min? b. After 6 min? c. After 10 min? d. After 20 min?

Radioactive Isotope #1: Uranium-238 How long is its half-life? How long will it take the...

Radioactive Isotope #1: Uranium-238 How long is its half-life? How long will it take the original radioactive product to reduce by 50%? How long will it take the original radioactive product to reduce by 25%? What material is the best application for this isotope? Describe the disadvantages and advantages of using this element for dating. What is the stable daughter product?

One kilogram of Refrigerant 134a vapor initially at 2 bar and 20°C fills a rigid vessel....

One kilogram of Refrigerant 134a vapor initially at 2 bar and 20°C fills a rigid vessel. The vapor is cooled until the temperature becomes -24°C. There is no work during the process. Let To = 20°C, po = 0.1 MPa and ignore the effects of motion and gravity. 2. For the refrigerant, determine the change in exergy, in kJ. Note: for part 1: q=-98.086kj please find part two- the change in exergy in kj

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