The principle of radiometric dating is summarized with the following formula: N = 1 No (1) where N is the current number of radioactive atoms in a sample, No is the initial number of radioactive atoms in a sample, ty is the length of time of one half-life of the radioactive element (measured in seconds), and t is the amount of time since the sample was formed (measured in seconds). This formula allows for the radiometric dating of rocks and other materials. Consider a rock that contains Uranium-238 that decays into Lead-206 with a half-life of 4.47 billion years. A rock is found that has 94.65% Uranium and 5.35% Lead - so, how old is this rock?

The principle of radiometric dating is summarized with the following formula: N = 1 No (1) where N is the current number of radioactive atoms in a sample, No is the initial number of radioactive atoms in a sample, ty is the length of time of one half-life of the radioactive element (measured in seconds), and t is the amount of time since the sample was formed (measured in seconds). This formula allows for the radiometric dating of rocks and other materials. Consider a rock that contains Uranium-238 that decays into Lead-206 with a half-life of 4.47 billion years. A rock is found that has 94.65% Uranium and 5.35% Lead - so, how old is this rock?