Physics, 18.03.2021 02:20, gabegabemm1

In order to decay to half, it will be 138 days. In order to half that again down to a quarter, it will be another 138 days. 138+138 is 276, thus, 276 days.

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In order to decay to half, it will be 138 days. In order to half that again down to a quarter, it wi...