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The half-life of a radio active element is 5 years. The fraction of the radioactive substance that remains after 20 years is

The half-life of a radio active element is 5 years. The fraction of the radioactive substance that remains after 20 years is

(a)

1/2

(b)

1/4

(c)

1/8

(d)

1/16

Answer:

Explanation