A freshly prepared radioactive sample of...

A freshly prepared radioactive sample of half-life 4 hours emits radiation of intensity which is 64 times the safe level. The minimum hours after which it would be safe to work with it is

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A radioactive source of halflife 2 h emits radiation of intensity which is 64 times the permissible safe level. The minimum time in hours after which it would be possible to work safely with the source is:

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A radioactive material of half-life time of 69.3 days is kept in a container. 2/3 rd of the substance remains undecayed after (given ln 3/2 = 0.4)

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Half life of a radioacitve substance is 4 hours . In how much time 7/8 of the substance would decay?

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