The radioisotope 15O (t1/2 = 122 s) is used to measure respiratory function. Patients inhale the...

The radioisotope ¹⁵O (t_1/2 = 122 s) is used to measure respiratory function. Patients inhale the gas, which is made by irradiating nitrogen gas with deuterons (²H). Consider a cubical cell measuring 1.24 cm on each edge, which holds nitrogen gas at a pressure of 2.25 atm and a temperature of 293 K. One face of the cube is uniformly irradiated with a deuteron beam having a current of 2.05 A. At the chosen deuteron energy, the reaction cross section is 0.21 b. (a) At what rate is ¹⁵O produced in the cell? (b) After an irradiation lasting for 60.0 s, what is the activity of ¹⁵O in the cell?

Expert Solution

genius_generous answered 1 year ago

Polonium-210, a naturally occurring radioisotope, is an α emitter, with t1/2 = 138 d. Assume that...

Polonium-210, a naturally occurring radioisotope, is an α emitter, with t1/2 = 138 d. Assume that a sample of 210^Po with a mass of 0.710 mg was placed in a 230.0 mL flask, which was evacuated, sealed, and allowed to sit undisturbed. What would the pressure be inside the flask (in mmHg) at 20 ∘C after 369 days if all the α particles emitted had become helium atoms? Please answer in mmHg, thank you.

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...

What detector(s) could be used to measure chloroacetaldehyde using GC? How would the detector(s) measure the...

What detector(s) could be used to measure chloroacetaldehyde using GC? How would the detector(s) measure the separated analyte?

1. What causes death in patients with COPD - respiratory causes or other causes? Why? 2....

1. What causes death in patients with COPD - respiratory causes or other causes? Why? 2. What are the three types of bronchodilators, and how do they function to alleviate the symptoms of COPD?

RESPIRATORY SYSTEM 1.Name each organ of the mammalian respiratory system and provide its function. 2.Use Boyle’s...

RESPIRATORY SYSTEM 1.Name each organ of the mammalian respiratory system and provide its function. 2.Use Boyle’s law and the anatomy of a mammal to explain how inhalation and exhalation occurs. 3.What is “partial pressure”? Explain its role in gas exchange. 4.What is the difference between external gills and internal gills? What are the advantages/disadvantages of each? 5.Structure determines function: what features are common in different respiratory organs, and how do these features help with gas exchange?

If T1 and T2 are independent exponential random variables, find the density function of R=T(2) -...

If T1 and T2 are independent exponential random variables, find the density function of R=T(2) - T(1). This is for the difference of the order statistics not of the variables, i.e. we are not looking for T2 - T1. It is implied that they are both from the same distribution. I know that fT(t) = λe-λt fT(1)T(2)(t1,t2) = 2 fT(t1)fT(t2) = 2λ2 e-λt1 e-λt2 , 0 < t1 < t2 and I need to find fR(r). From Mathematical Statistics and...

old fashion blood pressure moniters used a colum of mercury hg to measure patients blood preassure....

old fashion blood pressure moniters used a colum of mercury hg to measure patients blood preassure. given that mercury has a density of 13.6 g/ml how many milliliters of mercury would have a mass of 0.85

A function of the feedback control system is desired: = (2 (s + 1)) / (s...

A function of the feedback control system is desired: = (2 (s + 1)) / (s ^ 2 + 3s + 2). If the function transfer process is second order with gain = 4, time constant = 1, damping factor = 1.5, arrange the form of the PID controller function transfer using the direct synthesis method.

Describe two (2) ways by which respiratory, nervous, endocrine, and digestive systems function to aid the...

Describe two (2) ways by which respiratory, nervous, endocrine, and digestive systems function to aid the human bodyto be immuned against Corona Virus

given the transfer function G(s) = (1.151 s + 0.1774)/(s^3 + 0.739 s^2 + 0.921 s),...

given the transfer function G(s) = (1.151 s + 0.1774)/(s^3 + 0.739 s^2 + 0.921 s), write the state equations x'= Ax + Bu + Dw , and y = Cx for the system .

Question