Two radioactive nuclei A and B are present in equal numbers to begin with. Three days later, there are 3.35 times as many A nuclei as there are B nuclei. The half-life of species B is 1.93 days. Find the half-life of species A (in days).
Two radioactive nuclei A and B are present in equal numbers to begin with. Three days...
Two radioactive nuclei A and B are present in equal numbers to begin with. Three days later, there are 4.28 times as many A nuclei as there are B nuclei. The half-life of species B is 2.08 days. Find the half-life of species A (in days).
A radioactive sample contains two different types of radioactive nuclei: A, with half-life 9.0 days, and B, with half-life 18.0 days. Initially, the decay rate of the A-type nucleus is 256 times that of the B-type nucleus. 1) When will their decay rates be equal?
a radioactive sample has a half life of 10s if 20,000 nuclei are present at t=10s how many nuclei will be there at t = 40 s
In an experiment on the transport of nutrients in the root structure of a plant, two radioactive nuclides X and Y are used. Initially 2.50 times more nuclei of type X are present than of type Y. Just three days later there are 4.20 times more nuclei of type X than of type Y. Isotope Y has a half-life of 1.60 d. What is the half-life of isotope X?
In 9,748 seconds, the number of radioactive nuclei decreases to 1/16 of the number present initially. What is the half-life (in s) of the material? Enter an integer.
In 5,595 seconds, the number of radioactive nuclei decreases to 1/16 of the number present initially. What is the half-life (in s) of the material? Enter an integer.
Problem. The daughter nucleus formed in radioactive decay is often radioactive. In this case we have a decay chain as shown below A → B → C That is, atoms of A decay into an atoms of B and atoms of B decay into atoms of C. Let A0 represent the number of parent nuclei at time t = 0, A the number of parent nuclei at time t, and λ1 be the decay constant of the parent. Suppose the...
The half-life of 27Mg is 9.50 min. (a) Initially there were 4.10 × 101227Mg nuclei present. How many 27Mg nuclei are left 25.5 min later? Please give your answer to 2 significant figures. b) Calculate the 27Mg activities (in Ci) at t = 0 and t = 25.5 min. t= 0 __Ci t= 25 __ Ci
(b) [5 marks] Using first principles, derive the radioactive decay rate for nuclei whose decay constant is ?. Here R,-??, is the rate of decay at t-0 [5 marks] A count-rate meter is used to measure the activity of a given sample. At one instance it shows 4750 counts per minute (cpm). Five minutes later it shows 2700 cpm. Find the decay constant and the half-life of the sample. (c) (d) [5 Marks] For alpha decay, show that 13 markel...
An unknown radioactive element decays into non-radioactive substances. In 760 days the radioactivity of a sample decreases by 77 percent.(a) What is the half-life of the element?half-life: (days)(b) How long will it take for a sample of 100 mg to decay to 68 mg?time needed: (days)