I believe it’s reduce depression because it’s says in the question “mental”
It all depends on your height, weight, age, and physical health. It also can vary based on personal goals.
We can calculate the rate of decay by this formula Rate of Decay Formula
The rate of decay for radioactive particles is a first order decay process. This means it follows an exponential decay pattern which can be easily calculated.
Nt = the amount of radioactive particles are time (t)
N0 = the amount of radioactive particles at time = 0
λ = rate of decay constant
t = time
Taking the natural log of both sides of this equation (remember it is an exponential decay) will yield: