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Cesium-124 has a half-life of 30.9 s. a) How many Cs-124 nuclei are in 19 micrograms...

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Physics

Cesium-124 has a half-life of 30.9 s.

a) How many Cs-124 nuclei are in 19 micrograms of saidisotope?

b) How about after 2.4 min?

c) How strong is its activity then?

d) After which time has activity dropped below 1.0 Bq?

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