If 2 moles of an ideal monoatomic gas at temperature $$T_0$$ is mixed with 4 moles of another ideal monoatomic gas at temperature $$2 T_0$$, then the temperature of the mixture is

If the ratio of specific heat of a gas at constant pressure to that at constant volume is $$\gamma$$, the change in internal energy of the given mass of gas, when the volume changes from $$V$$ to $$2 V$$ at constant pressure $$p$$ is

From Wien's displacement law, $$\lambda_m T=$$ constant $$=0.00289 \mathrm{~m}-\mathrm{K}$$

Radiation from moon givens $$\lambda_m=4700 \mathop A\limits^o$$ and another wavelength of $$14 \times 10^{-6} \mathrm{~m}$$. Out of the following which conclusion(s) drawn is/are correct with the given information regarding the moon and the sun?

1. Sun radiations are reflected from moon's disc.

2. The temperature of moon's surface is $$207 \mathrm{~K}$$

3. The temperature of the sun is $$6160 \mathrm{~K}$$.

If two metallic plates of equal thickness and thermal conductivities $$K_1$$ and $$K_2$$ are put together face to face and a common plate is constructed, then the equivalent thermal conductivity of this plate will be