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4. A rock contains the radioactive isotope K – 40 that decays with a half-life of 1.3 billion years and the radioactive isotope Rb – 87 that decays with a half-life of 48.6 billion years. The rock is 100 million years old. The rock currently has 1000 times as many Rb – 87 atoms as there are K – 40 = 1000 × Ng:) When the rock first formed it had M times as many Rb – 87 atoms atoms. (That is, Nrb as K – 40 atoms. (That is, Nrb,0 = M × NK.0.) What is the value of M?

4. A rock contains the radioactive isotope K – 40 that decays with a half-life of 1.3 billion years and the radioactive isotope Rb – 87 that decays with a half-life of 48.6 billion years. The rock is 100 million years old. The rock currently has 1000 times as many Rb – 87 atoms as there are K – 40 = 1000 × Ng:) When the rock first formed it had M times as many Rb – 87 atoms atoms. (That is, Nrb as K – 40 atoms. (That is, Nrb,0 = M × NK.0.) What is the value of M?

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A rock contains the radioactive isotope ? − 40 that decays with a half-life of 1.3 ??????? ????? and the radioactive isotope ?? − 87 that decays with a half-life of 48.6 ??????? ?????. The rock is 100 ??????? ????? old. The rock currently has 1000 times as many ?? − 87 atoms as there are ? − 40 atoms. (That is, ??? = 1000 × ??.) When the rock first formed it had ? times as many ?? − 87 atoms as ? − 40 atoms. (That is, ???,0 = ? × ??,0.) What is the value of ??

4. A rock contains the radioactive isotope K – 40 that decays with a half-life of 1.3 billion years and the radioactive isotope Rb – 87 that decays with a half-life of 48.6 billion years. The rock is 100 million years old. The rock currently has 1000 times as many Rb – 87 atoms as there are K – 40 atoms. (That is, Nrb as K – 40 atoms. (That is, Rb,0 1000 x Ng.) When the rock first formed it had M times as many Rb – 87 atoms M x NK.0.) What is the value of M? -
Transcribed Image Text:4. A rock contains the radioactive isotope K – 40 that decays with a half-life of 1.3 billion years and the radioactive isotope Rb – 87 that decays with a half-life of 48.6 billion years. The rock is 100 million years old. The rock currently has 1000 times as many Rb – 87 atoms as there are K – 40 atoms. (That is, Nrb as K – 40 atoms. (That is, Rb,0 1000 x Ng.) When the rock first formed it had M times as many Rb – 87 atoms M x NK.0.) What is the value of M? -
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