At what temperature will the rms speed of air molecules be double that of NTP?

When the room temperature becomes equal to the dew point, the relative humidity of the room is

For an ideal gas, a cyclic process ABCA as shown in P-T diagram, when presented in P-V plot, would be

Temperature of a body $\theta$ is slightly more than the temperature of the surrounding $\theta_0$. Its rate of cooling $(R)$ versus temperature of the body $(\theta)$ is plotted. Its shape would be