The amount of time required for the decay of uranium 238 is the same as?1)  The age of the galaxy2)  The age of the universe3)  The age of the Earth

Uranium-235 has a half-life of 7.038×108 years.(i) Determine the time required for the mass of 235U in a sample originally containing 1.000 g of 235U to decrease to 0.125 g.

After three half-lives, % of uranium-238 isotopes have decayed.

7.Question 7Lead-lead dating is a great way to figure out the age of something that is close to the age of the solar system. It based on the radioactive decay of uranium.Uranium-238 decays (with intermediate steps) to lead-206 with a half life of 4.5 billion years. Uranium-235 decays to lead-207 with a half life of 0.7 billion years.Which one of the following statements is true?1 pointMeasuring the abundance of uranium-235 shows you how many half-lives have passed since the formation of the rockA higher ratio of lead-204 to lead-206 implies a younger rockThe technique requires finding parts of the meteorite with different abundances of lead and trying to determine how much extra lead exists because of uranium decayObjects which are younger will have more lead-207 than objects which are older.

A uranium-235 sample starts with 200 atoms, and 700 million years later, there are 100 atoms. What is the half-life of uranium-235?A.350 million yearsB.700 million yearsC.235 yearsD.100 year

The half-life of cesium-137 is 30 years. How many percent of the atoms of this isotope decay in 240 years?