GATE Mechanical Engineering (ME) 2021 Shift 1 Solved Paper

An infinitely long pin fin, attached to an isothermal hot surface, transfers heat at a steady rate of Q̇₁ to the ambient air. If the thermal conductivity of the fin material is doubled, while keeping everything else constant, the rate of steady-state heat transfer from the fin becomes Q̇₂. The ratio Q̇₂/Q̇₁ is