the decay of a radioactive material has a count rate is 2000 decays/min.  4 hours later, the decay rate is 500 counts/min.  what is the half-life?

Q: A radioactive material produces 3.522E+3 decays per minute at one time, and 5.47 h later produces…

A:

Q: 1. The decay of radioactive substance is given by 7 N = Noe (1), where N is the number of atoms…

A:

Q: The number of radioactive atoms in a sample decay as the emission of radiation proceeds and this may…

A:

Q: How many half-lives would have to elapse for a sample of a radioactive isotope to decrease from an…

A: No = 192 cpmN = 3 cpm

Q: Problem B The decay rate of a radioactive source decreases by 39% in 97 h. Determine the half-life,…

A: We can use the equation for radioactive decay:N(t) = N0 * e(-t)N0 is the initial amount of…

Q: the decay constant or the beta decay of ^99 43Tc was found to be equal to 1.0x10-13/s. What is the…

A:

Q: Technetium-99 is an unstable isotope. Given a half-life of 8.01 hours, what is the activity (in…

A: Determine the decay constant.

Q: Mass spectrometric analysis of potassium and argon atoms in a Moon rock sample shows that the ratio…

A:

Q: A radioactive sample has a decay constant of 2.97 x 10 s¹¹. Estimate the half-life.

A: Unstable nuclei decay into a stable state. This process is called radioactivity. The rate at which…

Q: Plutonium has a decay constant of 2.75 × 10-16 s-1. Activity of 1 g of sample will be 0.678x106 Bq.…

A:

Q: a sample containing l-131 has an activity of 6.4x10^8 Bq.h how many days later will the sample have…

A:

Q: A tree falls in a forest. How many years must pass before the C activity in 1.00 g of the tree's…

A: mass = 1 g number of atoms = number of moles * avogadro number  = (1/14)(6.022 * 1023) = 4.3 * 1022…

Q: radioactive

A:

Q: A nuclide whose "generic" symbol is 6430X would have protons and neutrons.

A: The generic symbol of a nuclide is given as X3064.

Q: A sample of carbon of mass 6.74 g taken from an animal jawbone has an activity of 4.00 decays/min.…

A: Given that the 6.74 g of carbon taken from the jawbone. The no. of moles in 6.74 g of carbon be…

Q: A radioactive sample is monitored with a radiation detector to produce 7640 counts per minute.…

A: Initial count is Final count is Time is Find:(a) Decay constant of the sample.(b) Half-life time.

Q: What is the Decay Rate (k), if the Half Life is 10.5 days?

A:

Q: Potassium-argon dating is used to measure the age of rocks formed from cooled lava by determining…

A: The radioactive dating of rocks formed from cooled lava is determined by using parallel decay of…

Q: A radioactive material produces 4.386E+3 decays per minute at one time, and 7.57 h later produces…

A:

Q: The number of radioactive nuclei present at the start of an experiment is 5.38 x 1015. The number…

A:

Q: The number of radioactive atoms in a sample decay as the emission of radiation proceeds and this may…

A: Radioactivity

Q: The half-life of a radioactive isotope is 140 d. How many days would it take for the decay rate of a…

A: Given that, Half life of the isotope, T = 140 days  We know that,  The half life is the time in…

Q: You have a 5.2 mol pure sample of an unknown material. After 1.2 h, you discover that 56% has…

A:

Q: Plutonium-239 (atomic number 94) is a by-product of nuclear power plants. It decays via alpha and…

A: A) decay constant = 0.693/half life = 0.693/24100 = 0.0000287 yr-1 = 0.693/(24100*365*86400) = 9.12…