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The half life of isotope #earthsciencerocks is 5 years. After 10 years, how much of the parent material remains?
A. 0%
B. 100%
C. 75%
D. 25%

Respuesta :

gefuerstenau

After 10 years, the isotope would have had two half lives. For each half life, half of the material reacts. Therefore, after one half life, 50% remains. Then, after a second, 25% remains. D is the correct answer.


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fichoh

Half-life refers to the time taken for a radioactive element to Decay to half it's original size. The percentage of the parent material left after 10 years is 25%

  • The original size or percentage of earthscience rocks = 100%

  • Half life = 5 years

The percentage left after 5 years :

  • 100% ÷ 2 = 50%

The percentage left after 10 years :

  • 50% ÷ 2 = 25%

Therefore, the percentage of the parent material left after 10 years is 25%

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