Home
Class 11
PHYSICS
Why is it hotter at the same distance ov...

Why is it hotter at the same distance over the top of a fire than in front of it?

A

air conducts heat upwards only

B

heat is radiated upwards only

C

convection of heat occurs upwards only

D

heat is radiated downwards only

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • TRANSMISSION OF HEAT

    NARAYNA|Exercise LEVEL -1 (C.W)|1 Videos
  • TRANSMISSION OF HEAT

    NARAYNA|Exercise LEVEL (C.W)|13 Videos
  • TRANSMISSION OF HEAT

    NARAYNA|Exercise LEVEL-II(C.W)|27 Videos
  • THERMODYNAMICS

    NARAYNA|Exercise Exercise|187 Videos
  • UNITS AND MEASUREMENTS

    NARAYNA|Exercise STATEMENT TYPE QUESTION|23 Videos

Similar Questions

Explore conceptually related problems

Why it is more hotter for same distance over the top of a candle than it in the side of its flame

Assertion It is hotter over the top of a fire than at the same distance on the sides . Reason In the upwared direction , the heat propagate through convection.

Assertion : It is hotter over the top of a fire than at the same distacne of the side. Reason : Air surrounding the fire conducts more heat upward

The rear wheel on a clown's bicycle has twice the radius of the front wheel. (a) When the bicycle is moving, is the linear speed at the very top of the rear wheel greater than, less than, or the same as that of the very top of the front wheel? (b) Is the angular speed of the rear wheel greater than, less than, or the same as that of the front wheel?

Why it is cooler at the top of a mountain than at sea level?

A vertical rod is partially submerged in an aquarium. You look at the aquarium from some distance. Does the underwater part of the rod appear to be closer than, farther than or the same distance as the top of the rod.

A train of length L move with a constant speed V_(t) . A person at the back of the train fires a bullet at time t = 0 towards a target which is at a distance of D ( at time t = 0 ) from the front of the train ( on the same direction of motion ). Another person at the front of the train fires another bullet at time t = T towards the same target. Both bullets reach the target at the same time. Assuming the speed of the bullets V_(b) are same, the length of the train is

Why a liquid boils at a lower tempetature at the top of a mountain than at sea level ?

NARAYNA-TRANSMISSION OF HEAT-C .U .Q
  1. In the following solids thermal conductivity is maximum for .

    Text Solution

    |

  2. For a perfect insulator coefficient of thermal conductivity is .

    Text Solution

    |

  3. Why is it hotter at the same distance over the top of a fire than in f...

    Text Solution

    |

  4. The process in which rate of transfer of heat maximum is .

    Text Solution

    |

  5. By which of the following methods could a cup of hot tea loss heat whe...

    Text Solution

    |

  6. The thermal radiations are similar to .

    Text Solution

    |

  7. The temperature at which a black body ceases to radiate energy is .

    Text Solution

    |

  8. The intensity of energy radiated by a hot body at distance r from it v...

    Text Solution

    |

  9. When a body has the same temperature as that of its surroundings

    Text Solution

    |

  10. One healf of a slab of ice is covered with black cloth and the other h...

    Text Solution

    |

  11. Compared to a person with white skin another person with dark skin wil...

    Text Solution

    |

  12. Which of the following statements is wrong ?

    Text Solution

    |

  13. The physical factor distinguishes thermal radiation from visible light...

    Text Solution

    |

  14. If we place our hand below a lighted electric bulb We feel warmer beca...

    Text Solution

    |

  15. Heating effect of the incoming solar radiation is maximum at local noo...

    Text Solution

    |

  16. The absorptivity of Lamp black and platinum black is .

    Text Solution

    |

  17. Absorptive power of a white body and of a perfectly black body respect...

    Text Solution

    |

  18. Three bodies A,B,C are at -27^(@)C, 0^(@)C, 100^(@)C respectively The ...

    Text Solution

    |

  19. At high temperature black body spectrum is .

    Text Solution

    |

  20. A black body emits

    Text Solution

    |