The isotope 208tl undergoes î² decay with a half-life of 3.1 min.
(a) what isotope is produced by the decay?
(b) how long will it take for 99.0% of a sample of pure 208tl to decay?
(c) what percentage of a sample of pure 208tl remains un-decayed after 1.0 h?

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.

7. in the cycle, a virus integrates its dna into the host's dna, and its dna is replicated when the host dna is replicated. a. infectious b. retroviral c. lysogenic d. lytic