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The radioactivity of a certain radioacti...

The radioactivity of a certain radioactive element drops to `1//64` of its initial value in `30` seconds. Its half-life is.

A

8 seconds

B

15 seconds

C

7.5 seconds

D

5 seconds

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The correct Answer is:
D
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AAKASH INSTITUTE-NUCLEI-Assignment Section A Objective (One option is correct )
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  2. Alpha rays emitted from a radioactive substance are

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