The half-life of nickel-63 is 100 years. If a sample of nickel-63 decays until 6.25% of the original sample remains, how much time has passed? *
6.25 years
100 years
400 years
1600 years
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Ответ:
400 years
Explanation:
The equation that describes the decay of a radioactive sample is:
where
m(t) is the amount of sample left at time t
In this problem we have:
After a time t, the amount of sample left is 6.25% of the original one, which means that
So we can rewrite the equation (1) and solving for t to find the time:
Ответ:
1.75 / 2 = 0.875 m
Explanation:
Provided the mirror is vertical and you are standing upright.
It could be most any altitude if the mirror is allowed any orientation.