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The Isotope Has a Half-Life of 7

Question 11

Multiple Choice

The isotope The isotope has a half-life of 7.5 seconds. If a sample contains 144 atoms of approximately how many such atoms were there present 30 seconds earlier? A) 576 B) 1152 C) 2304 D) 4320 E) 4.30 × 10<sup>8</sup> has a half-life of 7.5 seconds. If a sample contains 144 atoms of The isotope has a half-life of 7.5 seconds. If a sample contains 144 atoms of approximately how many such atoms were there present 30 seconds earlier? A) 576 B) 1152 C) 2304 D) 4320 E) 4.30 × 10<sup>8</sup> approximately how many such atoms were there present 30 seconds earlier?


A) 576
B) 1152
C) 2304
D) 4320
E) 4.30 × 108

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