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Which half-life is longer?

Exercise and reference answers

Questions
  1. A
    Carbon-14, 5730 years
    B
    Uranium-238, 1.25 billion
    Higher value
    Uranium-238, 1.25 billion
  2. A
    Uranium-235, 700 million
    B
    Carbon-14, 5730 years
    Higher value
    Uranium-235, 700 million
  3. A
    Uranium-238, 1.25 billion
    B
    Uranium-235, 700 million
    Higher value
    Uranium-238, 1.25 billion
  4. A
    Carbon-14, 5730 years
    B
    Uranium-235, 700 million
    Higher value
    Uranium-235, 700 million
Instructions
Tap the isotope with the longer half-life.

Explanation

_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 2 'The Chemical Foundation of Life', sections 2.1-2.3_
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