First slide

Radio activity

Question

The half life of $131_{I}$ is 8 days, given a sample of $131_{I}$ at time t = 0, we can assert that

Moderate

A

no nucleus will decay before t = 4 days
B

no nucleus will decay before t = 8 days
C

all nuclei will decay before t = 16 days
D

a given nucleus may decay at any time after t = 0

Solution

Nuclear decay is a random process.

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