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Suppose 128 radioactive atoms have a half-life of 15 seconds. Approximately how many radioactive atoms will be left after 60 seconds?
A. 32
B. 16
C.8
D. None

Respuesta :

onyebuchinnaji

The amount of the radioactive atom that will be left after 60 seconds is 8 g.

The given parameters;

  • initial mass of the radioactive atom, N₀ = 128 g
  • half-life of the radioactive atom, [tex]t_{1/2}[/tex] = 15 seconds
  • time of the radioactive, t = 60 seconds

The amount of the radioactive atoms that will be left after 60 seconds is calculated as follows;

0 --------------------------------- 128 g

15 s ------------------------------ 64 g

30 s ----------------------------- 32 g

45 s ----------------------------- 16 g

60 s ------------------------------ 8 g

Thus, the amount of the radioactive atom that will be left after 60 seconds is 8 g.

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