Q:The material that formed the earth was created in a supernova explosion approx

Question

Q:The material that formed the earth was created in a supernova explosion approximately 6 billion years ago. The two most common isotopes of uranium, 238U and 235Uwere created in roughly equal amounts. Today, the earth contains more than 100 times as much 238U as 235U.

Which isotope has a longer half-life? Select the correct answer and explanation.

A:

235U has a longer half-life because more of it have decayed. 235U has a longer half-life because less of it have decayed. 238U has a longer half-life because less of it have decayed. 238U has a longer half-life because more of it have decayed.

Explanation / Answer

238U has a longer half-life because less of it have decayed.

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