JEE Main 2003 — Thermodynamics

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

During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratio $\mathrm{C}_{\mathrm{p}} / \mathrm{C}_{\mathrm{v}}$ for the gas is

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

In the nuclear fusion reaction ${ }_1^2 \mathrm{H}+{ }_1^3 \mathrm{H} \rightarrow{ }_2^4 \mathrm{He}+\mathrm{n}$ given that the repulsive potential energy between the two nuclei is $\sim 7.7 \times 10^{-14} \mathrm{~J}$, the temperature at which the gases must be heated to initiate the reaction is nearly [Boltzmann's Constant $\mathrm{k}=1.38 \times 10^{-23} \mathrm{~J} / \mathrm{K}$ ]

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