Home
Class 12
PHYSICS
At room temperature (27^(@)C) the r.m.s ...

At room temperature `(27^(@)C)` the r.m.s speed of the molecules of a certain diatomic gas is found to be `1920 ms^(-1)`. The gas is:

A

`O_(2)`

B

`H_(2)`

C

`F_(2)`

D

`CI_(2)`

Text Solution

Verified by Experts

The correct Answer is:
B
`v_(rms) =sqrt((3RT)/(M)) rArr v_(rms)^(2) =(3RT)/(M)`
`M=(3xx8 cdot 32xx300)/((1920)^(2))=2xx10^(-3) kg`
`M=2g.`
Thus, gas is Hydrogen
Hence, correct choice is (b).
Promotional Banner

Topper's Solved these Questions

  • HEAT AND THERMODYNAMICS

    MODERN PUBLICATION|Exercise Multiple Choice Questions (LEVEL-II)|55 Videos

  • HEAT AND THERMODYNAMICS

    MODERN PUBLICATION|Exercise Multiple Choice Questions (Level - III) (Questions From AIEEE/JEE Examination)|17 Videos

  • GRAVITATION

    MODERN PUBLICATION|Exercise Recent Competitive Questions|8 Videos

  • LAWS OF MOTION

    MODERN PUBLICATION|Exercise Revision test|43 Videos

Similar Questions

Explore conceptually related problems

The temperature at which most probable speed of CO molecules is twice that at 27^(@)C is :

At room temperature (27.0^(@)C) the resistance of a heating element is 100 Omega. What is the temperature of the element if the resistance is found to be 117 Omega. given that the temperature coefficient of the material of the resistor is 1.70 xx 10 ^(-4)"" ^(@)C^(-1).

The temperature at which the r.m.s. velocity of gas molecules is doubled than that at 27^(@)C is :

The r.m.s. velocity of molecules of a gas of density 4kg //m^(3) and pressure 1.2 xx 10^(5) N//m^(2) is

MODERN PUBLICATION-HEAT AND THERMODYNAMICS-Recent Competitve Questions
  1. At room temperature (27^(@)C) the r.m.s speed of the molecules of a ce...

    Text Solution

    |

  2. The temperature of a gas contained in a closed vessel of constant volu...

    Text Solution

    |

  3. Hot water cools from 60^(@)C" to "50^(@)C in the first 10 min and to 4...

    Text Solution

    |

  4. The efficiency of Carnot's heat engine is 0.5 when the temperature of ...

    Text Solution

    |

  5. A perfect gas at 27^(@)C is heated at constant pressure so as to doubl...

    Text Solution

    |

  6. The quantities of heat required to raise the temperatures of two coppe...

    Text Solution

    |

  7. Which one of the following is v(m)-T graph for perfectly black body ? ...

    Text Solution

    |

  8. A hot body is allowed to cool. The surrounding temperature is constant...

    Text Solution

    |

  9. One mole of an ideal gas is taken from A to B, from B to C and then ba...

    Text Solution

    |

  10. For which combination of working temperatures of source and sink the e...

    Text Solution

    |

  11. Two stars A and B radiate maximum energy at the wavelength of 360 nm a...

    Text Solution

    |

  12. What is the source temperature of the Carnot engine required to get 70...

    Text Solution

    |

  13. A cycle tyre bursts suddenly. What is the type of this process ?

    Text Solution

    |

  14. In anomalous expansion of water at what temperature, the density of wa...

    Text Solution

    |

  15. 1 gram of ice is mixed with 1 gram of steam. At themal equilibrium, th...

    Text Solution

    |

  16. Water is heated from 0^(@)C" to "10^(@)C, then its volume

    Text Solution

    |

  17. The average energy of molecules in a sample of oxygen gas at 300K are ...

    Text Solution

    |

  18. In an isochoric process

    Text Solution

    |