Home
Class 11
PHYSICS
If a body at 27^(@)C emits 0.3 watt of h...

If a body at `27^(@)C` emits `0.3` watt of heat then at `627^(@)C`, it will emit heat equal to -

A

`24.3` watt

B

`0.42` watt

C

`2.42` watt

D

`0.9` watt

Text Solution

AI Generated Solution

To find the heat emitted by a body at a temperature of \(627^\circ C\) given that it emits \(0.3\) watts at \(27^\circ C\), we can use Stefan-Boltzmann Law, which states that the power radiated by a black body is proportional to the fourth power of its absolute temperature. ### Step-by-Step Solution: 1. **Convert Celsius to Kelvin**: - The absolute temperature in Kelvin is given by \(T(K) = T(°C) + 273\). - For \(T_1 = 27^\circ C\): \[ ...
Promotional Banner

Topper's Solved these Questions

  • HEAT TRANSFER

    BANSAL|Exercise Exercise|89 Videos
  • GRAVITATION

    BANSAL|Exercise EXERCISE -4 Section - B|6 Videos
  • KINETIC THEORY OF GASES

    BANSAL|Exercise Section-B|13 Videos

Similar Questions

Explore conceptually related problems

A heat engine absorbs 300J of heat at 627^(@)C and rejects a part of it at 27^(@)C . Find the work done by the engine.

A carnot engine takes in 1000 K cal of heat from a reservoir at 627^(@)C and exhausts heat to sink at 27^(@)C . What is its efficiency? What is useful work done//cycle by the engine.

A black body initially at 27^(@)C is heated to 327^(@)C is heated to 327^(@)C . How many times is total heat emitted at the higher temperature than emitted at lower temperature ? What is the wavelength of the maximum energy radiation at the higher temperature ? Wien's constant = 2.898 xx 10^(-3) mK .

A black body at 27^(@)C surrounds another black body at -73^(@)C . Calculate the net heat transfer per second per square meter of the body at higher temperature..

A black body A at a temperature of 527^(@)C , emits radiant energy at the rate of 16 watt. Another black body B at temperature 127^(@)C , emits radiant energy at the rate 8 watt in the same surrounding. Compare the surface areas of A and B.

A body of emissivity (e = 0.75) , surface area of 300cm^(2) and temperature 227^(@)C is kept in a room at temperature 27^(@)C . Calculate the initial value of net power emitted by the body.

The energy emitted per second by a black body at 1227^(@)C is E. If the temperature of the black body is increased to 2727^(@)C the energy emitted per second in the terms of E in the second case.

The heat produced by a 100 watt heater in 2 minute will be equal to

A black body at temperature 227^(@)C radiates heat at the rate of 5 cal/ cm^(2) , at a temperature of 27^(@)C , the rate of heat radiated per unit area per unit time in cal/ cm^(2) s, is

BANSAL-HEAT TRANSFER-Exercise
  1. The temperature of a body is increased by 50%. The amount of radiation...

    Text Solution

    |

  2. Radius of a shere is R density is d and specific heat is s, Is is heat...

    Text Solution

    |

  3. If a body at 27^(@)C emits 0.3 watt of heat then at 627^(@)C, it will ...

    Text Solution

    |

  4. If the rate of emission of radiation by a body at temperature TK is E ...

    Text Solution

    |

  5. A liquid takes 10 minutes to cool from 80^(@)C to 50^(@)C. The tempera...

    Text Solution

    |

  6. A metallic sphere cools from 50^(@)C to 40^(@)C in 300 seconds. If the...

    Text Solution

    |

  7. Two stars A and B radiate maximum energy at wave lengths 4000Å and 500...

    Text Solution

    |

  8. Four rods with different radii r and length l are used to connect two ...

    Text Solution

    |

  9. The heat is flowing through two cylinderical rods of same material. Th...

    Text Solution

    |

  10. A rod of 1m length and area of cross-section 1cm^(2) is connected acro...

    Text Solution

    |

  11. Two rods are connected as shown. The rods are of same length and same ...

    Text Solution

    |

  12. A slab consists of two layers of different materials of the same thick...

    Text Solution

    |

  13. Two identical square rods of metal are welded end to end as shown in f...

    Text Solution

    |

  14. Two rods of length d(1) and d(2) and coefficients of thermal conductiv...

    Text Solution

    |

  15. A cylinder of radius R made of a material of thermal conductivity K(1)...

    Text Solution

    |

  16. The wall with a cavity consists of two layers of brick separated by a ...

    Text Solution

    |

  17. A rod of length L and uniform cross-sectional area has varying thermal...

    Text Solution

    |

  18. Three identical rods AB, CD and PQ are joined as shown. P and Q are mi...

    Text Solution

    |

  19. A composite rod made of three rods of equal length and cross-section a...

    Text Solution

    |

  20. A black metal foil is warmed by radiation from a small sphere at tempe...

    Text Solution

    |