An ideal monatomic gas is confined in a cylinder by a spring-loaded piston of cross-section 8×10−3 m2. Initially the gas is at 300 K and occupies a volume of 2.4×10−3 m3 and the spring is in a relaxed state. The gas is heated by a small heater coil H. The force constant of the spring is 8000 N/m and the atmospheric pressure is 1.0×105 Pa. The cylinder and piston are thermally insulated. The piston and the spring are massless and there is no friction between the piston and cylinder. There is no heat loss through heater coil is negligible. With all the above assumptions, if the gas is heated by the heater until the piston moves out slowly by 0.1 m, then the final temperature is