The R.M.S. speed of the molecules of a gas of density 4 kg m-3 and pressure 1.2 * 105 N m-2 is :

Rms=whole under root 3P/d.      Where P is pressure in pascal and d is density in kg/m^3. There fore.     Rms=whole underroot (3*1.2*10^5)/4.    = wholeroot 360000/4.                   This is equal to whole root90000.                                                                                           Therefore ans=300m/s
 
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