Which of the following statements are true about decay rates and half-lives? 1)M

Question

Which of the following statements are true about decay rates and half-lives?

1)Much of the heat generated near the core of Earth is believed to be due to radioactive decay.
2)A large decay constant implies a short half-life.
3)Radioactive nuclei decay over time according to an exponential decay law.
4)Half-life is the time it takes for a radioactive sample to decay away to nothing.
5)A large decay constant means that the isotope has a low activity.
6)In carbon dating, the radioactive isotope of carbon that is used is carbon-14 (14C).

Explanation / Answer

3)Radioactive nuclei decay over time according to an exponential decay law. True ,nuclie decay time depends on the decaylaw.
True ,nuclie decay time depends on the decaylaw. 4)Half-life is the time it takes for a radioactive sample to decay away to nothing. False, Half-life is the time it takes for a radioactive sampleto decay away tohalf of the nuclie.
False, Half-life is the time it takes for a radioactive sampleto decay away tohalf of the nuclie. 5)A large decay constant means that the isotope has a low activity. False, because large decay constant indicates the highrate as well as high activity                        Rate = ?[nuclie]
False, because large decay constant indicates the highrate as well as high activity                        Rate = ?[nuclie] False, because large decay constant indicates the highrate as well as high activity                        Rate = ?[nuclie] 6)In carbon dating, the radioactive isotope of carbon that is used is carbon-14 (14C). True

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