# Dating rocks using radioactive decay Free online granny webcam

That number is also the amount of parent that has decayed (remember the rule #parent #daughter = constant). in the age measurements of less than 100 million years.

The narrow range of ages is taken to be how long it took the parent bodies of the meteorites to form.

However, the crater number relation must be calibrated against something with a known age.

The long ages (billions of years) given by radioactive dating of rocks seems an impossibly long time for some people.After another half-life, there is 1/2 of that 1/2 left = 1/2 × 1/2 = 1/4 of original amount of the parent left.After yet another half-life, there is 1/2 of that 1/4 left = 1/2 × 1/2 × 1/2 = 1/8 of the original amount of the parent left (which is the fraction asked for).In radioactive atoms the nucleus will spontaneously change into another type of nucleus.When looking at a large number of atoms, you see that a certain fraction of them will change or dating system because you can determine accurate ages from the number of remaining radioactive atoms in a rock sample.