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A rock sample has 25% of its original radioactive element and the half-life of the element is 1 million years. How old is the sample?.

Sagot :

A rock sample approximately has 500.000 years old.

Why are elements called radioactive?

  • A useful concept half-life has formula which can be used to calculate the age of a specific material ( N(t) = N0[eλ*t] -).
  • its known the half life is 1.000.000, so it's 2.000.000, and 25% of it is 500.000. Thus we know the sample was 500.000 years old.
  • When the atoms of an element have extra neutrons or protons it creates extra energy in the nucleus and causes the atom to become unbalanced or unstable. Whether radioactive elements can become stable and if so, how. The unstable nucleus of radioactive atoms emit radiation.
  • The four common radioactive elements found in the periodic table are Uranium, Radium, Polonium, and Thorium.
  • Radioactivity is the act of emitting radiation spontaneously. This is done by an atomic nucleus that, for some reason, is unstable; it wants to give up some energy in order to shift to a more stable configuration.

Learn more about  radioactive elements here: brainly.com/question/17551878

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