What is the unit of measurement of radioactivity ?

What is the unit of measurement of radioactivity ?
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The unit of radioactivity measure is Becquerel.
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Which of the following statements about radioactivity is are true? a)It involves outer electrons activity b)It is not affected by temperature of press

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How can radioactivity be used to to date rocks?

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What substances that emit high amounts of radioactivity?

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'Stone Cancer' occurs due to – (1) Acid rain (2) Global warming (3) Radioactivity (4) Bacterial action

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