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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
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
  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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CBSE 11-science - Physics
Which of the three modes of transfer of heat is the fastest?
Asked by Topperlearning User | 15 Apr, 2015, 04:32: PM
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CBSE 11-science - Physics
One thermometer is placed half metre above the tip of the fire and one thermometer is placed half metre at the side of the fire. Would the readings of the two thermometers be same or different and why?
Asked by Topperlearning User | 15 Apr, 2015, 04:38: PM
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