A freshly prepared radioactive source of half -life 2 hours emits radiations 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 isA. 6 hoursB. 12 hoursC. 24 hoursD. 128 hours

A freshly prepared radioactive source of half -life 2 hours emits radi

1.	A freshly prepared radioactive source of half -life 2 hours emits radiations 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 isA. 6 hoursB. 12 hoursC. 24 hoursD. 128 hours
Answer» Correct Answer - B `N = (N_(0))/(64) = (N_(0))/(2^(6)) :. N = 6` Thus total time `= 2xx 6 = 12hr`

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A freshly prepared radioactive source of half -life 2 hours emits radiations 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 isA. 6 hoursB. 12 hoursC. 24 hoursD. 128 hours

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