A freshly prepared radioactive source of half-life 2 h 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 h 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

From R = R 0 1 2 n we have, 1 = 64 ( 1 2 ) n Or number of half lives = n = 6 ∴ t = n × t t 1 / 2 = 6 × 2 = 12 h

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