Home
Class 11
PHYSICS
The thickness of a metallic plate is 0.4...

The thickness of a metallic plate is 0.4 cm. The temperature between its two surfaces is `20^(@)C`. The quantity of heat flowing per second is 50 calories from `5cm^(2)` area. In CGS system, the coefficient of thermal conductivity will be

A

0.2

B

0.3

C

0.4

D

0.5

Text Solution

Verified by Experts

The correct Answer is:
A
We know that
`Q/t=(KA(Deltatheta))/t`
`50 = (5 xx 20K)/(0.4)` or `K=(50 xx 0.4)/(5 xx 20) = 0.2`
Promotional Banner

Topper's Solved these Questions

  • CALORIMETRY AND HEAT TRANSFER

    DC PANDEY|Exercise Match the columns|4 Videos

  • CALORIMETRY & HEAT TRANSFER

    DC PANDEY|Exercise Level 2 Subjective|14 Videos

  • CENTRE OF MASS

    DC PANDEY|Exercise Medical entrances gallery|27 Videos

Similar Questions

Explore conceptually related problems

Two plates of equal areas are placed in contact wih each other. Their thickness are 2.0 cm and 5.0 cm respectively. The temperature of the external surface of the first plate is -20^(@)C and that of the external surface of the second plate is 20^(@)C . What will be the temperature of the current surface if the plates (i) are of the same material, (ii) have thermal conductivities in the ratio 2:5 .

One end of a metal rod of length 1.0 m and area of cross section 100 cm^(2) is maintained at . 100^(@)C . If the other end of the rod is maintained at 0^(@)C , the quantity of heat transmitted through the rod per minute is (Coefficient of thermal conductivity of material of rod = 100 W//m-K )

Two parallel plates A and B are joined together to form a compound plate . The thicknesses of the plate are 4.0cm and 2.5cm respectively and the area of cross section is 100cm^(2) for each plate. The thermal conductivities are K_(A)=200Wm^(-1) ^(@)C^(-1) for the palte B. The outer surface of the plate A is maintainned at 100^(@)C and the outer surface of the plate A is maintained at 100^(@)C . and the outer surface of the plate B is maintained at 0^(@)C. Find (a) the rate of heat flow through any cross section, (b) the temperature at the interface and (c) the equivalent thermal conductivity of the compound plate.

The human body transports heat from the interior tissues, at temperature 37.0^(@)C , to the skin surface, at temperature 27.0^(@)C , at a rate of 100 W. If the skin area is 1.5 m^(2) and its thickness is 3.0 mm, what is the effective thermal conductivity, k, of skin?

One mode of an ideal monatomic gas is kept in a rigid vessel. The vessel is kept inside a steam chamber whose temperature is 97^(@)C . Initially, the temperature of the gas is 5.0^(@)C . The walls of the vessel have an inner surface of area 800cm^(2) and thickness 1.0cm If the temperature of the gas increases to 9.0^(@)C in 0.5 second, find the thermal conductivity of the material of the walls.

A rod of 40 cm in length and temperature difference of 80^(@)C at its two ends. Another rod B of length 60cm and of temperature difference 90^(@)C , having the same area of cross-section. If the rate of flow of heat is the same, then the ratio of their thermal conductivities will be

‘cold box’ in the shape of a cube of edge 50 cm is made of ‘thermocol’ material 4.0 cm thick. If the outside temperature is 30^(@)C the quantity of ice that will melt each hour inside the ‘cold box’ is : (the thermal conductivity of the thermocol material is 0.050 W//mK)

Calculate the rate of loss of heat through a glass window of area 1000 cm^(2) and thickness 0.4 cm when temperature inside is 37^(@)C and outside is -5^@)C . Coefficient of thermal conductivity of glass is 2.2 xx 10^(-3) cal s^(-1) cm^(-1) K^(-1) .

DC PANDEY-CALORIMETRY AND HEAT TRANSFER-Medical entrance s gallery
  1. Same quantity of ice is filled in each of the two metal container P an...

    Text Solution

    |

  2. Two identical rods are connected between two containers. One of them i...

    Text Solution

    |

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

    Text Solution

    |

  4. Certain quantity of water cools from 70^(@)C to 60^(@)C in the first 5...

    Text Solution

    |

  5. A piece of iron is heated in a flame. It first becomes dull red then b...

    Text Solution

    |

  6. The temperature of the two ends A and B of a rod of length 25cm and ci...

    Text Solution

    |

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

    Text Solution

    |

  8. In a room where the temperature is 30^(@)C, a body cools from 61^(@)C ...

    Text Solution

    |

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

    Text Solution

    |

  10. 500 kg of water is heated from 20^(@) to 100^(@) C . Calculate the inc...

    Text Solution

    |

  11. Water is used in car radiators as coolant because

    Text Solution

    |

  12. A body cools from 60^@C to 50^@C in 10 min. Find its temperature at ...

    Text Solution

    |

  13. If the radius of a star is R and it acts as a black body, what would b...

    Text Solution

    |

  14. Liquid oxygen at 50 K is heated to 300 K at constant pressure of 1 atm...

    Text Solution

    |

  15. The temperature at which a black body of unit area loses its energy at...

    Text Solution

    |

  16. A rod AB is 1m long. The temperature of its one end A is maintained at...

    Text Solution

    |

  17. Two slabs A and B of different materials but of the same thickness are...

    Text Solution

    |

  18. A piece of blue glass heated to a high temperature and a piece of red ...

    Text Solution

    |

  19. The temperature gradient in a rod of 0.5 m length is 80^(@)C//m. It th...

    Text Solution

    |

  20. The thickness of a metallic plate is 0.4 cm. The temperature between i...

    Text Solution

    |