A particular power plant operates with a heat-source reservoir at 623.15K(350C) and a heat-sink reservoir at 303.15K(30C). It has a thermal efficiency equal to 55% of the Carnot-engine thermal efficiency for the same temperatures. - What is the thermal efficiency of the plant? - To what temperature must the heat-source reservoir be raised to increase the thermal efficiency of the plant to 35% ? Again is 55% of the Carnot-engine value