The graph which represent the variation of mean kinetic energy of molecules with temperature t°C is
3. Mean kinetic energy of gas molecule E=f2kT =f2kt+273=f2kt+f2×273 k ; Comparing it with standard equation of straight line y=mx+c. We get m=f2k and c=f2273k . So the graph between between E and t will be straight line with positive intercept on E‐axis and positive slope with t‐axis.