A freshly prepared radioactive source of half-life 2 hours emits radiation of intensity which is 64 times the permissible safe level. The minimum time after which it would be possible to work safely with this source is

Question

A freshly prepared radioactive source of half-life 2 hours emits radiation of intensity which is 64 times the permissible safe level. The minimum time after which it would be possible to work safely with this source is, 6 h, 12 h, 24 h, 128 h

MARKS App · Accepted Answer

N N 0 = 1 2 t t 1 2 1 64 = 1 2 t t 1 2 t t 1 2 = 6 Therefore t = 6 × t 1 2

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