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Which of the following statements are true?
1. All radioactive elements decay exponentially with time.
2. Half-life time of radioactive elements is the time required for one-half of the radioactive atoms to disintegrate.
3. Age of the earth can be determined by radioactive dating.
4. Half-life time of a radioactive element is fifty percent of its average life period.
Select the correct answer:
Which of the following statement regarding radioactive decay is correct?  Average life equals to 1.44 of half-life. Half-life is directly proportional to decay constant. The decay of element is proportional to no of atoms or moles.
Emission of β-particles during radioactive decay of a substance is from
Nuclear wastes is waste that contains radioactive material. Radioactive material is normally a by product of nuclear power generation. Radioactive waste is regulated by government agencies in order to protect human health and the environment. Radioactivity naturally decays over time, so radioactive waste has to be isolated and confined in appropriate disposal facilities for a sufficient period until it no longer poses a threat. Which of the following statements can be inferred from the paragraph?
A radioactive substance has a half life of four months, three-fourth of the substance would decay in
A radioactive substance has a half-life of four months. Three-fourth of the substance would decay in
The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then
The half-life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half-life period of a radioactive substance is one month, then?
What did Willard Frank Libby invent when he observed that one in a trillion carbon atoms is radioactive and that these radioactive atoms decay at a constant rate?
Emission of β-rays in radioactive decay results in the change of either mass or charge.