(a) During one half-life,
11400 12.5 18 19 21 22 40 5700 6.25 archaeolologists argon date decay detection geologists half igneous lead long proportions radiocarbon safety short uranium very of the radioactive atoms initially present in the sample
11400 12.5 18 19 21 22 40 5700 6.25 archaeolologists argon date decay detection geologists half igneous lead long proportions radiocarbon safety short uranium very and this fact can be used to
11400 12.5 18 19 21 22 40 5700 6.25 archaeolologists argon date decay detection geologists half igneous lead long proportions radiocarbon safety short uranium very materials.
(b) Certain
11400 12.5 18 19 21 22 40 5700 6.25 archaeolologists argon date decay detection geologists half igneous lead long proportions radiocarbon safety short uranium very isotopes, which have a
11400 12.5 18 19 21 22 40 5700 6.25 archaeolologists argon date decay detection geologists half igneous lead long proportions radiocarbon safety short uranium very 11400 12.5 18 19 21 22 40 5700 6.25 archaeolologists argon date decay detection geologists half igneous lead long proportions radiocarbon safety short uranium very half-life, decay via a series of relatively short-lived radioisotopes to produce stable isotopes of
11400 12.5 18 19 21 22 40 5700 6.25 archaeolologists argon date decay detection geologists half igneous lead long proportions radiocarbon safety short uranium very .
(c) The relative
11400 12.5 18 19 21 22 40 5700 6.25 archaeolologists argon date decay detection geologists half igneous lead long proportions radiocarbon safety short uranium very of uranium and lead isotopes in a sample of igneous rock can, therefore, be used to date the rock.
(d) The proportions of the radioisotope potassium-
11400 12.5 18 19 21 22 40 5700 6.25 archaeolologists argon date decay detection geologists half igneous lead long proportions radiocarbon safety short uranium very , with
11400 12.5 18 19 21 22 40 5700 6.25 archaeolologists argon date decay detection geologists half igneous lead long proportions radiocarbon safety short uranium very protons and
11400 12.5 18 19 21 22 40 5700 6.25 archaeolologists argon date decay detection geologists half igneous lead long proportions radiocarbon safety short uranium very neutrons, and its stable decay product argon with
11400 12.5 18 19 21 22 40 5700 6.25 archaeolologists argon date decay detection geologists half igneous lead long proportions radiocarbon safety short uranium very protons and
11400 12.5 18 19 21 22 40 5700 6.25 archaeolologists argon date decay detection geologists half igneous lead long proportions radiocarbon safety short uranium very neutrons, can also be used by
11400 12.5 18 19 21 22 40 5700 6.25 archaeolologists argon date decay detection geologists half igneous lead long proportions radiocarbon safety short uranium very to date
11400 12.5 18 19 21 22 40 5700 6.25 archaeolologists argon date decay detection geologists half igneous lead long proportions radiocarbon safety short uranium very rocks from which the gaseous
11400 12.5 18 19 21 22 40 5700 6.25 archaeolologists argon date decay detection geologists half igneous lead long proportions radiocarbon safety short uranium very has been unable to escape.
(e) The same idea can be used by
11400 12.5 18 19 21 22 40 5700 6.25 archaeolologists argon date decay detection geologists half igneous lead long proportions radiocarbon safety short uranium very to date organic artifacts like wood and cloth from excavations using '
11400 12.5 18 19 21 22 40 5700 6.25 archaeolologists argon date decay detection geologists half igneous lead long proportions radiocarbon safety short uranium very ' dating. The half-life of carbon-14 is 5700 years.
(f) If only 50% of the carbon-14 is left the object is
11400 12.5 18 19 21 22 40 5700 6.25 archaeolologists argon date decay detection geologists half igneous lead long proportions radiocarbon safety short uranium very years old. If only
11400 12.5 18 19 21 22 40 5700 6.25 archaeolologists argon date decay detection geologists half igneous lead long proportions radiocarbon safety short uranium very % of the carbon-14 is left, the artifact is 17100 years old.
(g) An organic object containing 25% of the original carbon-14 is
11400 12.5 18 19 21 22 40 5700 6.25 archaeolologists argon date decay detection geologists half igneous lead long proportions radiocarbon safety short uranium very years old. If only
11400 12.5 18 19 21 22 40 5700 6.25 archaeolologists argon date decay detection geologists half igneous lead long proportions radiocarbon safety short uranium very % of carbon-14 was left it would be 22800 years old!
(h) Half-life data is also important in choosing a radioactive isotope for a particular '
11400 12.5 18 19 21 22 40 5700 6.25 archaeolologists argon date decay detection geologists half igneous lead long proportions radiocarbon safety short uranium very ' job.
(i) For example in medical examinations a radioisotope should have a
11400 12.5 18 19 21 22 40 5700 6.25 archaeolologists argon date decay detection geologists half igneous lead long proportions radiocarbon safety short uranium very half-life for
11400 12.5 18 19 21 22 40 5700 6.25 archaeolologists argon date decay detection geologists half igneous lead long proportions radiocarbon safety short uranium very reasons. However, in a smoke detector a
11400 12.5 18 19 21 22 40 5700 6.25 archaeolologists argon date decay detection geologists half igneous lead long proportions radiocarbon safety short uranium very half-life radioisotope is needed to avoid the alarm going off too soon as the signal changes too soon!