The half-life of a decaying radioactive isotope is given. Please determine its decay constant in the unit of per-second. Note: one year is defined as 365 days not 365.25 days.
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I think you meant to say "one year is defined as 365.25 days, not 365 days" (in which case you might want to make it 365.2425 days, or 365.2422).
May I suggest adding more info about radioactive decay?
This wikipedia link should be sufficient: https://en.wikipedia.org/wiki/Radioactive_decay#Half-life