Question

Tritium is a radioactive isotope of hydrogen that decays by about 5% per year. A large bottle of water that contained 856,000 tritium atoms remained undisturbed for 13 years. How much tritium does the bottle contain now?

Answer 1

Answer: if you’re rounding to the nearest whole number it’s

439,421

Step-by-step explanation:

Answer 2

The number of tritium atoms that the bottle contains now is; 439,384.8 atoms.

How much tritium does the bottle contain now?

It follows from the task content that;

• The large bottle of water that contained 856,000 tritium atoms remained undisturbed for 13 years.

On this note, the number of atoms remaining is;

N = 856,000 × (0.95)¹³

N = 856,000 × 0.5133

N = 439,384.8 atoms

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