4. If 175 undecayed nuclei remain from a sample of 2800 nuclei, how many half-

lives have passed? (Show your work.) *

Your answer

Question

Chemistry

Rowan Richard

26 March, 18:50

4. If 175 undecayed nuclei remain from a sample of 2800 nuclei, how many half-

lives have passed? (Show your work.) *

Your answer

+4

Answers (1)

Know the Answer?

Barrett · Answer 1

X = 4

Explanation:

Start 2800

End 175

175 = 2800x (0.5) ^X

175/2800 = 0.5^X

0.0625 = 0.5^X

log (0.5 x) = log (0.0625)

x · log (0.5) = log (0.0625)

-0.301x = - 1.204

x = - 1.204/-0.301

x = 4

4. If 175 undecayed nuclei remain from a sample of 2800 nuclei, how many half-lives have passed? (Show your work.) *Your answer

4. If 175 undecayed nuclei remain from a sample of 2800 nuclei, how many half-

lives have passed? (Show your work.) *

Your answer