An old piece of wood has a carbon-14 content of 0.0156 times that 14 is the age of the old wood if the half-life of C is 5,730 years?

39. How many milligrams remain of a 15.0 mg sam- ple of radium-226 after 6396 years? The half-life of radium-226 is 1599 years.

Uranium is radioactive and decays into lead.  This process can be used to date rocks.  A piece of zirconium was dated using this process and it was found that this rock contained 3.8x10-3 grams of uranium and 2.4x10-5 grams of lead.  If the half-life of uranium is 4.41x109 years how old is the rock? Hint: moles U + moles Pb = moles U initially in the sample (Parent)

What is the half-life of chromium-56 if 12.8 minutes are required for the activity of a sample of chromium-56 to fall to 22.3 percent of its original value?

If an ancient piece of wood is found to have one-sixteenth the original amount of carbon-14 in it, then how old is it if the half-life of this isotope in 5,730 years?

The cloth shroud from around a mummy is found to have a 14C activity of 8.3 disintegrations per minute per gram of carbon as compared with living organisms that undergo 16.3 disintegrations per minute per gram of carbon.   From the half-life for 14C decay, 5715 yr, calculate the age of the shroud.

The cloth shroud from around a mummy is found to have a 14C activity of 9.8 disintegrations per minute per gram of carbon as compared with living organisms that undergo 16.3 disintegrations per minute per gram of carbon.     Part A From the half-life for 14C decay, 5715 yr calculate the age of the shroud. Express your answer using two significant figures.

A grain sample was found in a cave. The ratio of ¹C/C was 1/16 the value in a fresh grain sample. How old on yr) was the grain in the cave! The half life of C-14 is 5000 years yr

The half-life of carbon-14 is about 5730 years. If an ancient leather strap is about 11,500 years old, what percentage of carbon-14 in a now-living object remains in the strap? O 100% 50% O 25 % none O O O O