The half life for the radioactive decay of potassium-40 to argon-40 is 1.26 x 10° years. Suppose nuclear chemical analysis shows that there is 0.380 mmol of argon-40 for every 1.000 mmol of potassium-40 in a certain sample of rock. Calculate the age of the rock. Round your answer to 2 significant digits. years ?

A radioactive isotope has a half-life of 14.8 hrs. Calculate its rate constant.  Show work

Hi, I need help with this step-by-step, please. Thank you.    Even more interesting is how the researchers determined the age of the sharks. Normally, youcould look at the decay of carbon-14 in the bone of an animal to determine its age. By comparingthe current amount of carbon-14 in the bone to the amount of carbon-14 that was in the boneinitially, you can determine how much time has passed (the age of the animal). This doesn’twork with Greenland sharks, though! Greenland sharks don’t have bones. They just havecartilage. Researchers determined, however, that the carbon-14 in certain proteins in the eye lensof the sharks could be dated because those proteins are set from the time that the shark is bornand are never replaced (most proteins in living organisms are constantly being broken down andreplaced, but not these proteins in the eye lens of the Greenland shark!).[Here’s the problem to solve and the information you need to solve it.] Let’s assume thatresearchers find a new Greenland…

An archaeologist finds some ancient jewelry made from bone. The jewelry has a carbon mass of 484 g (HINT: Assume all the carbon is 12C and determine the number of atoms, 12C has a molar mass of 12 g/mol) and careful measurements show that the remaining 14c has a current decay rate of 11 decays/s. Determine the age of the bone (and presumably the jewelry). The ratio of 14C to 12c when the animal died was 1.25x10-12 & the half-life of 14c is 5730 y. Additionally, 1 mol = 6.022x1023 365.25 days, & 1 day = 24 h. particles, 1 y = age of bone =

The half-life of the radioactive isotope 137Cs is 30.17 years. How long does one have to wait until exactly 3% of the initial amount of this isotope remains? O A. 200.4 years O B. 140.1 years O C. 152.6 years O D. 29.26 years O E. 170.3 years

The first-order decay of iron-59 has a half-life of 44,495 days. How many grams of iron-59 decompose after one month (assume it is in April) if the sample initially weighs 100.0 g?

The half life for the radioactive decay of potassium-40 to argon-40 is 1.26 x 10 years. Suppose nuclear chemical analysis shows that there is 0.280 mmol of argon-40 for every 1.000 mmol of potassium-40 in a certain sample of rock. Calculate the age of the rock. Round your answer to 2 significant digits. |years

A certain drug has a half-life in the body of 7.5 h. What should the interval betwe 60.% of its initial concentration? Round your answer to 2 significant digits.

please answer all as they are part of 1 question but different questions,,.