The graph, shown in the figure represents the variation of temperature $\left(T\right)$ of two bodies, $x$ and $y$ having the same surface area, with time $\left(t\right)$ due to emission of radiation. Find the correct relation between the emissivity and absorptive power of the two bodies.

A block of steel heated to $100°\mathrm{C}$ is left in a room to cool. Which of the curves shown in the figure [Fig.] & represents the correct cooling behaviour ?

The three graphs marked $1, 2, 3$ in figure represents the radiant energy $E_{\lambda }$ versus wavelength $\lambda$ of radiation emitted by three sources - sun, welding arc and tungsten filament bulb respectively. Which of the following options is the correct match ?

Which one of the following is $v_m-T$ graph, Fig, for perfectly black body? $v_m$ is the frequency of radiation with maximum intensity, $T$ is the absolute tempearture.