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

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Q: 96 (IAS/1994)
The half-life of a radio active element is 5 years. The fraction of the radioactive substance that remains after 20 years is
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question_subject: 

Science

question_exam: 

IAS

stats: 

0,54,74,11,41,22,54

keywords: 

{'radioactive substance': [0, 1, 1, 0], 'years': [1, 0, 0, 2], 'radio': [0, 1, 0, 3], 'active element': [0, 1, 0, 0], 'fraction': [0, 1, 0, 0]}