In a simplified model of Earth's atmosphere, temperature decreases with altitude h as T(h)=T0−Λh, where Λ is the lapse rate. Assuming the atmosphere is in adiabatic equilibrium and the air behaves as an ideal diatomic gas (γ=7/5), derive the lapse rate Λ in terms of g, M (molar mass of air), R (gas constant), and γ.