Home
Class 12
PHYSICS
Consider two hot bodies B(1) and B(2) wh...

Consider two hot bodies `B_(1)` and `B_(2)` which have temperature `100^(@)"C"` and `80^(@)"C"` respectively at t = 0. The temperature of surroundings is `40^(@)" C"`. The ratio of the respective rates of cooling `R_(1)` and `R_(2)` of these two bodies at` t = 0` will be

A

`3:2`

B

`5:4`

C

`2:1`

D

`4:5`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • HEAT TRANSFER & THERMAL EXPANSION

    MOTION|Exercise EXERCISE - 2|45 Videos

  • HEAT TRANSFER & THERMAL EXPANSION

    MOTION|Exercise Exercise - 3 Section-A|21 Videos

  • HEAT TRANSFER & THERMAL EXPANSION

    MOTION|Exercise SPECIFIC PROBLEMS –|5 Videos

  • HEAT - 1

    MOTION|Exercise EXERCISE -4 (Level - II) Previous Year | JEE Advanced|22 Videos

  • HEAT-2

    MOTION|Exercise EXERCISE-4 (LEVEL-II)|30 Videos

Similar Questions

Explore conceptually related problems

A body cools at the rate of 3^(@)C// min when its temperature is 50^(@)C . If the temperature of surroundings is 25^(@)C then the rate of cooling of the body at 40^(@)C is

A body is heated to a temperature of 75^(@)C and is allowed to cool. If the temperature of the surrounding is 35^(@)C , then the temperature at which the rate of cooling will be exactly half of that initially will be

A body cools in 7 min from 60^@C to 40^@C What will be its temperature after the next 7 min? The temperature of surroundings is 10^@C .

A body takes 10min to cool from 60^(@)C " to" 50^(@0C . If the temperature of surrounding is 25^(@)C , then temperature of body after next 10 min will be

Two spherical black bodies of radii R_(1) and R_(2) and with surface temperature T_(1) and T_(2) respectively radiate the same power. R_(1)//R_(2) must be equal to

A body cools from 50^@C " to " 40^@C in 5 min. If the temperature of the surrounding is 20^@C , the temperature of the body after the next 5 min would be

MOTION-HEAT TRANSFER & THERMAL EXPANSION -EXERCISE - 1
  1. The rate of cooling of a body depends on –

    Text Solution

    |

  2. A solid sphere, a cube and a plate, all are made of same material and ...

    Text Solution

    |

  3. Consider two hot bodies B(1) and B(2) which have temperature 100^(@)"C...

    Text Solution

    |

  4. According to Newton’s law of cooling ms (d theta)/(dt)=-K(theta-theta0...

    Text Solution

    |

  5. is temperature of surroundings in K, then the value of K on the basis ...

    Text Solution

    |

  6. A body takes, 4 minutes to cool from 100^(@)C to 70^(@)C, if the room ...

    Text Solution

    |

  7. When placed in air at 30^(@)C, the temperature of a body decreases fro...

    Text Solution

    |

  8. Frequency for maximum energy radiation of ideal black body at tempertu...

    Text Solution

    |

  9. The wavelength of maximum emitted energy of a body at 700 K is 4.08 mu...

    Text Solution

    |

  10. The spectral emissive power of a black body at a temperature of 6000K ...

    Text Solution

    |

  11. Temperature of an ordinary bulb is 3000^@K. At what wave length will i...

    Text Solution

    |

  12. If for a black body the graph of change is emissive power at different...

    Text Solution

    |

  13. An iron ball is heated. The percentage increase will be the largest in...

    Text Solution

    |

  14. Two holes of unequal diameters d(1) and d(2)(d(1)gt d(2)) are cut in m...

    Text Solution

    |

  15. Two rods of length l(1) and l(2) are made of material whose coefficien...

    Text Solution

    |

  16. A metallic bar is heated from 0^(@)C to 100^(@)C. The coefficient of l...

    Text Solution

    |

  17. A metal wire of length jl and area of cross - section A is fixed betwe...

    Text Solution

    |

  18. The temperatuire of a pendulum, the time period of which is t, is rais...

    Text Solution

    |

  19. A pendulum clock has an iron pendulum 1 m long (alpha("iron")=10^(-5) ...

    Text Solution

    |

  20. The density of a substance at 0^(@)C is 10 g//c c and at 100^(@)C, its...

    Text Solution

    |