Home
Class 12
CHEMISTRY
What is the significance of resistance r...

What is the significance of resistance ratio, `rho_(300k)//rho_(4.2k)`?

Text Solution

Verified by Experts

Resistance to the flow of electrons decreases the conductivity of metals. It decreases with increase in temperature. But presence of impurity in metals increases conductivity. The resistance ratio, at room temperature and at liquid helium temperature is a measure of the purity of metal
Promotional Banner

Topper's Solved these Questions

  • SOLIDS STATE

    AAKASH SERIES|Exercise SUBJECTIVE EXERCISE - 1 (SHORT ANSWER QUESTIONS)|6 Videos

  • SOLIDS STATE

    AAKASH SERIES|Exercise SUBJECTIVE EXERCISE - 1 (VERY SHORT ANSWER QUESTIONS)|4 Videos

  • SOLID STATE

    AAKASH SERIES|Exercise PRACTICE SHEET - 5|30 Videos

  • SOLUTIONS

    AAKASH SERIES|Exercise Objective Exercise -4|50 Videos

Similar Questions

Explore conceptually related problems

What is the significance of resistance ratio, rho_(300 K) // rho_(4.2K) ?

Two rods of same length and areas of cross-section A_(1) and A_(2) have their ends maintained at same temperature. If K_(1) and K_(2) are their thermal conductivities, c_(1) and c_(2) are the specific heats of their material and rho_(1),rho_(2) their densities, then for the rate of flow by conduction through them to be equal

What is the relation between resistance (R),"resistivity"(rho), length(l) and area of cross section (A) of a conductor ?

What is the ratio of the rate constants K_(1) and K_(2) ?

For a reaction the activation energy is zero. What is the value of rate constant at 300K . ["Given"k_(280K)=1.6xx10^(6)s^(-1),R=8.314J "mol"^(-1)K^(-1)]

AAKASH SERIES-SOLIDS STATE-PRACTICE EXERCISE
  1. What is the significance of resistance ratio, rho(300k)//rho(4.2k)?

    Text Solution

    |

  2. Which of the following is considered as true amorphous solid

    Text Solution

    |

  3. The various types of ionic solids differ in their

    Text Solution

    |

  4. In CsCl structure, each Cst ion is surrounded by

    Text Solution

    |

  5. In crystal structure of sodium chloride, the arrangement of Cl^(-) ion...

    Text Solution

    |

  6. In which of the following, cation occupies cubic void.

    Text Solution

    |

  7. Which of the following possess 2 : 1 type of structure.

    Text Solution

    |

  8. The positions of Cl^(-) ions in NaCl structure are

    Text Solution

    |

  9. The number of NaCl units present in a unit cell of NaCl are

    Text Solution

    |

  10. The atomic radius for a face - centred cubic cell of lattice   paramet...

    Text Solution

    |

  11. The lattice parameter (edgelength) for a body-centred cubic cell of at...

    Text Solution

    |

  12. {:("List - I","List - II"),("A) Ionic solid","1) soft"),("B) Covalent ...

    Text Solution

    |

  13. The lattice parameter for a simple cubic unit cell of atomic radius 'r...

    Text Solution

    |

  14. The packing fraction in a simple cubic cell of crystals is :

    Text Solution

    |

  15. A solid AB has NaCl type structure. If the radius of the cation A is 1...

    Text Solution

    |

  16. Which one of the following statements is incorrect about rock salt typ...

    Text Solution

    |

  17. In sodium chloride, Cl^(-) ions form ccp arrangement. In which sites, ...

    Text Solution

    |

  18. The packing fraction in a face - centred cubic cell of crystals is

    Text Solution

    |

  19. A hydrogen bonded molecular crystal among the following:

    Text Solution

    |

  20. The crystal system of a compound with unit cell dimensions a = 0.387, ...

    Text Solution

    |

  21. {:("List - I","List - II"),("(Crystal System)","(Exmaple)"),("A) Ortho...

    Text Solution

    |