Equal volumes of hydrogen and oxygen (relative molar masses 2 and 32, respectively) in separate containers are equimolar and exert equal pressure. The rms speeds of hydrogen and oxygen molecules are in the ratio

At what temperature will the rms velocity of a gas molecule be double its value at NTP ?

The rms speed of the molecules of a gas is 200 m/s at 27 °C and 1 atmosphere pressure. The rms speed at 127 °C and double the pressure is

The temperature at which helium molecules have the same rms speed as hydrogen molecules at STP is $[M_H=2g\mathrm{/}mole,M_{He}=4g\mathrm{/}mole][M\_\{H\}\; =2g/mole\; ,\; M\_\{He\}\; =\; 4g/mole]$

The number of degrees of freedom for a rigid diatomic molecule is

For polyatomic molecules having f vibrational modes, the ratio of two specific heats $\frac{C_p}{C_v}\backslash frac\{C\_p\}\{C\_v\}$ is :

A nonlinear triatomic molecule has …… degree(s) of freedom of rotational motion.

The wavelength range of thermal radiation is

Which of the following materials is diathermanous ?

The coefficient of reflection of a perfectly opaque body is 0.16. Its coefficient of emission is