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CBSE Class 11-science Answered

Why is a new quilt warmer than an old quilt?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
answered-by-expert Expert Answer

New quilt has more air pockets in it as compared to an old quilt. As air is a bad conductor of heat it does not allow heat from our body to flow to the surroundings.

Answered by | 04 Jun, 2014, 03:23: PM

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CBSE 11-science - Physics
a body cools from 90°c to 70°c in 5minutes. temperature of surrounding is 30°c. its temperature after next 10 min is
Asked by manjushri30nov | 31 Dec, 2023, 07:48: PM
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CBSE 11-science - Physics
the unit of thermal conductivity is
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Asked by abhishekmadheshiya708 | 22 Dec, 2023, 01:38: PM
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CBSE 11-science - Physics
  The temperature of perfect black body changes from 3000K to 4000K.What is the percentage change in energy radiation.
Asked by ankitvariya1000 | 29 Mar, 2022, 11:19: AM
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CBSE 11-science - Physics
The temperature of perfect black body changes from 3000K to 4000K.What is the percentage change in energy radiation.
Asked by jatinsahu37 | 27 Mar, 2022, 04:45: PM
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CBSE 11-science - Physics
A furnace emits radiation at 2000 K. Treating it as black body radiation, calculate Wave length at which emission is maximum and the corresponding radiant flux density
Asked by vikranthpoluparthi1 | 04 May, 2021, 12:30: PM
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CBSE 11-science - Physics
 A furnace emits radiation at 2000 K. Treating it as a black body radiation, calculate the monochromatic radiant flux density at 1 micron m wavelength
Asked by prabhakararao viriyala | 14 Jun, 2020, 12:17: PM
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CBSE 11-science - Physics
There are two thin spheres A and B of the same material and same thickness.They emit like black bodies.Radius of A is double that of B.A and B have same tempt. T .When A and B are kept in a room of tempt T0(less than T),the ratio of their rates of cooling (rate of fall of tempt) is
Asked by m.nilu | 08 Dec, 2018, 02:03: PM
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CBSE 11-science - Physics
Two bodies A and B have emissivities 0.5 and 0.8 respec .At some tempt the two bodies have emissive powers at these tempt.
Asked by m.nilu | 08 Dec, 2018, 01:49: PM
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CBSE 11-science - Physics
Explain the working of room heater. How can we increase the efficiency of convections in radiator of a room heater?
Asked by Topperlearning User | 15 Apr, 2015, 04:28: PM
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CBSE 11-science - Physics
By what mode of heat transfer is mercury heated?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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