Question

Half time is 32 h and how much time take for its 75prcnt disintegration

Answer 1

Hey friend

If the half time of the radioactive substance is 32 hours it will lose half of its nuclei in 32 hours.

Let us start from beginning

After 32 h only 50% nuclei will remain

50% of 50% is 25%

That means after 32 hours only 25% nuclei will remain

75% of the nuclei is disintegrated in 32+32=64 hours

Hence your answer is 64 hours

Hope it helps

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