the resistance, Ro of a platinum varies with temperature theta °C as measured by a constant-volume gas thermometer according to the equation R theta= Ro(1+ 800 a theta - a theta²) The resistance ,Ro of platinum varies with temperature theta°C as measured by a constant volume gas thermometer according to the equation Rtheta=Ro(1+800atheta-atheta²) where a is a constant. Calculate the temperature on the platinum scale corresponding to 400°C on the gas scale?