Home
Class 12
PHYSICS
A strip of copper another of germanium a...

A strip of copper another of germanium are cooled from room temperature to 80 K. The resistance of

A

copper increases, germanium decreases

B

copper decreases and germanium increases

C

each of them increases

D

each of them decreases.

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • TEXTUAL QUESTIONS

    MODERN PUBLICATION|Exercise EXERCISE|507 Videos

  • STRUCTURE OF NUCLEUS

    MODERN PUBLICATION|Exercise EXERCISE|47 Videos

  • TEXUAL QUESTIONS

    MODERN PUBLICATION|Exercise EXERCISE|195 Videos

Similar Questions

Explore conceptually related problems

A piece of copper and another of germanium are cooled from room temperature to 100 K. What will happen to their conductivities? Explain.

Si and Cu are cooled from 300 K to a temperative of 60 K. Then resistivity

A piece of germanium and another of copper are stated to experience a rise in temperature. The resistance of

A sample of paramagnetic salt contains 2.0 xx 10^24 atomic dipoles each of dipole moment 1.5 xx 10^-23 JT^-1 . The sample is placed under a homogeneous magnetic field of 0.64 T, and cooled to a temperature of 4.2 K. The degree of magnetic saturation achieved is equal to 15%. What is the total dipole moment of the sample for a magnetic field of 0.98 T and a temperature of 2.8 K? (Assume Curie’s law)

Answer the following questions based on the P-T phase diagram of CO_2 What happens when CO_2 at 4 atm pressure is cooled from room temperature at constnat pressure?

Newton 's Law of Cooling : According to Newton 's law of cooling the rate of cooling is directly proportional to the temperature difference of body and its surrounding .If body cools from theta_(1) "to" theta_(2) in t seconds then (ms(theta_(1) -theta_(2))/(t)=alpha[(theta_(1)+theta_(2))/(t)- theta_(0)] . Where theta_(0) is the temperature of the surrounding . Is the statement true?

A heating element using nichrome connected to a 230 V supply draws an initial current of 3.2 A which settles after a few seconds to a steady value of 2.8 A. What Is the steady temperature of the heating element If the room temperature is 27.0^@C ? Temperature coefficient of resistance of nichrome averaged over the temperature range involved is 1.70 xx 10^-4@C .

Fe_(3)O_(4) is ferrimagnetic at room temperature but at 850K it becomes::

The variation of resistance of a metallic conductor with temperature is shown in figure. Calculate the temperature coefficient of resistance from the graph.

MODERN PUBLICATION-TEXTUAL QUESTIONS-EXERCISE
  1. In Bohr's model of hydrogen atom, the electron moves around the nucleu...

    Text Solution

    |

  2. The potential difference applied to an X-ray tube is 5 kV and the curr...

    Text Solution

    |

  3. A strip of copper another of germanium are cooled from room temperatur...

    Text Solution

    |

  4. The current I and voltage V curves for a given metallic wire at two di...

    Text Solution

    |

  5. The temperature coefficient of resistance of a wire is 0.00125 per deg...

    Text Solution

    |

  6. How many calories of heat will approximately be developed in a 210 W e...

    Text Solution

    |

  7. A 25 W and a 100 W bulbs are joined in parallel and connected to A.C. ...

    Text Solution

    |

  8. The heating element of a heater should be made with a material, which ...

    Text Solution

    |

  9. Find the ratio of resistances when two heater wires of equal lengths a...

    Text Solution

    |

  10. If two bulbs of wattage 25 and 100 respectively each rated at 220 volt...

    Text Solution

    |

  11. A constant voltage is applied between the two ends of a uniform metall...

    Text Solution

    |

  12. What is immaterial for an electric fuse?

    Text Solution

    |

  13. Six equal resistances are connected between points P,Q and R as shown ...

    Text Solution

    |

  14. A wire of length L and 3 identical cells of negligible internal resist...

    Text Solution

    |

  15. A cell of e.m.f E is connected across a resistance r. The potential di...

    Text Solution

    |

  16. A current of 2.0 A passes through a cell of emf 1.5 V having internal ...

    Text Solution

    |

  17. Five resistance are connected as shown in the figure. The effective re...

    Text Solution

    |

  18. One ampere is equivalent to

    Text Solution

    |

  19. Assuming that the charge of an electron is 1.6 xx 10^-19C, the number ...

    Text Solution

    |

  20. The specific resistance ofo a wire 1.1 m long, 0.4 mm in diameter and ...

    Text Solution

    |