Question

A random radioisotope has a decay constant of 0.00238 years-1. If

1165 years have past, and there was originally 80 grams of it,
roughly how many grams of the original radioisotope remain?

Answer 1

5 grams remain

Step-by-step explanation:

A = A₀exp(-k·t) 80g·exp(-0.00238yr⁻¹)(1165yrs) = 80g x 0.063 = 5 grams remain