Home
Class 12
PHYSICS
The value closest to the thermal velocit...

The value closest to the thermal velocity of a helium atom at room temperature (300 K) in `ms^(-1) is :[ k_(B)=1.4xx10^(-23) j//k, m_(He)=7xx10^(-27) kg]`

A

`1.3xx10^(4)`

B

`1.3xx10^(5)`

C

`1.3xx10^(2)`

D

`1.3xx10^(3)`

Text Solution

Verified by Experts

The correct Answer is:
D
`v=sqrt(3k_(B)T//m_(He))=sqrt((3xx1.4xx10^(-23)xx300)/(7xx10^(-27)))`
`=1.34xx10^(3)m//s`
Promotional Banner

Topper's Solved these Questions

  • THERMAL PROPERTIES OF MATTER

    DISHA PUBLICATION|Exercise Exercise-1: Concept Builder (Topicwise)|69 Videos

  • THERMAL PROPERTIES OF MATTER

    DISHA PUBLICATION|Exercise Exercise-2 (Concept Applicator)|28 Videos

  • SYSTEM OF PARTICLES & ROTATIONAL MOTION

    DISHA PUBLICATION|Exercise EXERCISE-2 : CONCEPT APPLICATOR|28 Videos

  • THERMODYNAMICS

    DISHA PUBLICATION|Exercise EXERCISE -2 : CONCEPT APPLICATOR|29 Videos

Similar Questions

Explore conceptually related problems

Estimate the average thermal energy of a helium atom at (i) room temperature (27^(@)C) . Boltzmann constant =1.38 xx 10^(-23) JK^(-1)

Calculate the pH of 0.02 M H_2S (aq) given that K_(a_1)=1.3xx10^(-7), K_(a_2)=7.1xx10^(-15)

The de Broglie wavelength of an electron in a metal at 27^(@)C is ("Given"m_(e)=9.1xx10^(-31)kg,k_(B)=1.38xx10^(-23)JK^(-1))

The approximate number of air molecules in a 1 m^3 volume at room temperature (300 K) and atmospheric pressure is (Use R = 8.2 xx 10^(-5 ) m^3 atm/mol K and N_A =6.02 xx 10^(23) mol^(-1) )

Estimate the average energy of a helium atom at (i) room temperature (27^(@)C) (ii) the temperature on the surface of the sun (6000 K) and (iii) the temperature of 10^(7)K . Given k_(B) = 1.38 xx 10^(-23) J "molecule"^(-1) K^(-1)

Calculate the percentage hydrolysis of decinormal solution of ammonium acetate given that k_(a) = 1.75 xx 10^(-5), K_(b) =1.80 xx 10^(-5) and K_(w) = 1.0 xx 10^(-14)

Estimate the average thermal energy of a helium atom at (i) room temperature (27^(@)C) (ii) the temperature on the surface of the sun (6000K), (iii) the temperature of 10 million kelvin (the typical core temperature in the case of a car)

DISHA PUBLICATION-THERMAL PROPERTIES OF MATTER -Exercise-2 (Concept Applicator)
  1. The value closest to the thermal velocity of a helium atom at room tem...

    Text Solution

    |

  2. A metallic rod l cm long, A square cm in cross-section is heated throu...

    Text Solution

    |

  3. A glass sinker has a mass M in air, When weighed in a liquid at temper...

    Text Solution

    |

  4. Two marks on a glass rod 10 cm apart are found to increase their dista...

    Text Solution

    |

  5. If a bar is made of copper whose coefficient of linear expansion is on...

    Text Solution

    |

  6. Two vertical glass tubes filled with a liquid are connected by a capil...

    Text Solution

    |

  7. The maximum energy is the thermal radiation from a hot source occurs a...

    Text Solution

    |

  8. The rectangular surface of area 8 cm xx 4 cm of a black body at temper...

    Text Solution

    |

  9. The radiant energy from the Sun incident normally at the surface of ea...

    Text Solution

    |

  10. A hot body placed in air is cooled down according to Newton's law of c...

    Text Solution

    |

  11. 1 g of water in liquid phase has volume 1 cm^(3) and in vapour phase 1...

    Text Solution

    |

  12. Two rods of the same length and areas of cross-section A1 and A2 have ...

    Text Solution

    |

  13. Two straight metallic strips each of thickness t and length l are rive...

    Text Solution

    |

  14. The temperature of the two outer surfaces of a composite slab consisti...

    Text Solution

    |

  15. A glass flask of volume 1 litre is fully filled with mercury at 0^(@)C...

    Text Solution

    |

  16. A sinker of weight w0 has an apparent weight w1 when weighed in a liqu...

    Text Solution

    |

  17. In a thermocouple, the temperature of the cold junction and the neutra...

    Text Solution

    |

  18. Two identical rods of copper and iron are coated with wax uniformly. W...

    Text Solution

    |

  19. The top of an insulated cylindrical container is covered by a disc hav...

    Text Solution

    |

  20. The two ends of a rod of length L and a uniform cross-sectional area A...

    Text Solution

    |

  21. A body cools in a surrounding which is at a constant temperature of th...

    Text Solution

    |