For radioactive decay, we can relate current amount, initial amount, decay constant and time using:
N = No x exp(-λt)
Half-life = ln(2)/λ
λ = ln(2) / 5730
N/No = 80% = 0.8
0.8 = exp( -ln(2)/5730 x t)
t = 1844 years
I remember learning this last y’all i jus don’t remember it might be A or C
Temperature is a measure of the average kinetic energy of the
particles in an object.