Which of the following are correct for radioactivity?

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The half life of $C - 14$ in $C O_{2}$ is different from that in $C_{6} H_{12} O_{6}$ .

Half life is independent of initial amount of radioactive substance.

Half life ofvU-235 and U-238 are different.

On increasing temperature half life will decrease.

answer is A, D.

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Detailed Solution

An individual radioactive isotope's half-life is unaffected by environmental factors and is independent of the isotope's starting concentration.Uranium-238 has a half-life of approximately 4.5 billion years, uranium-235 of approximately 700 million years, and uranium-234 of around 250 thousand years.

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