In the system of Problem 18.1, suppose the perturbation is turned on at t=0 and off at t=T. What is ∣c2(T)∣2 (in first-order perturbation theory)? Assume that ω≈ω0, and give a simple formula for the probability of transition to state 2 in terms of γ, T, ω0−ω, and ℏ.