thermodynamics Questions

The earth radiates in the infra-red region of the spectrum. The spectrum is correctly given by:

A carnot engine takes $3\times 10^6\text{cal}$ of heat from a reservoir at $627^{\circ }\text{C}$, and gives it to a sink at $27^{\circ }\text{C}$. The work done by the engine is:

According to Newton’s law of cooling, the rate of cooling of a body is proportional to $(\Delta \theta {)}^n$, where $\Delta \theta$ is the difference of the temperature of the body and the surroundings, and $n$ is equal to:

In the nuclear fusion reaction ${}_1^2\text{H}{+}_1^3\text{H}{\to }_2^4\text{He}+\text{n}$, given that the repulsive potential energy between the two nuclei is $7.7\times 10^{-14}\text{J}$, the temperature at which the gases must be heated to initiate the reaction is nearly: (Boltzmann’s constant $k=1.38\times 10^{-23}\text{J/K}$)

"Heat cannot by itself flow from a body at lower temperature to a body at higher temperature" is a statement of consequence of:

During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratio $C_p/C_v$ for the gas is:

Which of the following parameters does not characterize the thermodynamic state of matter?