You discover a rock that contains 75% uranium-235 and 25% lead-207.?

Question

1. Which of the two elements present in the sample is the parent and which is the daughter?

2. There are a number of assumptions that need to be made in order to calculate the age of this sample using radiometric dating methods. How much lead-207 and how much uranium-235 must you assume were present when the granite formed?

3. Given the half-life for uranium-235 is 713 million years, determine the age of the granite sample.

If anyone can help me with these questions, it would be greatly appreciated.
Thanks Louise.

Answer 1

1. Uranium is parent, lead is the daughter ( uranium breaks down into lead )

2. Uranium 100%, lead 0%

3. half of 713 MY is 356,500,000 years.

Answer 2

1.Lead is the dad and Uranium is the daughter... Uranium just sounds like a girl's name.

2. Uh, I'm guessing a bunch.

3. half of 713 million

Answer 3

I can only answer 1. Uranium is the parent and lead is the daughter. Uranium has a higher atomic number and can decay into lead, but not vice versa.

Answer 4

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