Please answer in python

Exercise 2: Modeling a Two-Element Decay Chain Next we consider a particular decay chain containing only two elements, a parent and a daughter. Polonium-210 decays to lead-206 by emitting an alpha particle with a half-life of 138.376 days. In order to model the population of 210 Po at any given time, we can use a simple exponential decay function: Npo(t) = Npoo exp(-at), where Npo(t) denotes the amount of 210 Po remaining at time t from an initial stock Npoo = 1 (assume that we begin our simulation with 1 kilogram of 210 Po and no 206 Pb present). Compose a function N_Po( t ), for Npo(t), which accepts an argument t denoting time elapsed in seconds, and returns N, the amount of 210 Po remaining. [ ]: #grade # Compose your function 'N_PO' here. def N_Po( t ): Calculate the remaining portion of Po-210 at a given time. Args: t: time elapsed, s Returns: N: population of remaining Po-210 # Hint: use L_decay! pass