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(a) What is meant by half life of a radioactive element,

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(a) What is meant by half life of a radioactive element? 

(b) The half life of a radioactive substance is 20s. Calculate: 

(i) the decay constant and 

(ii) time taken for the sample to decay by 7/8th of the initial value.

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(a) Half-life period: The half-life period of a radioactive substance is defined as the time in which one-half of the radioactive substance is disintegrated.

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