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CBSE - XI Science - Physics - Thermal Properties of Matter

Find the ratio of rate of radiations from two solid sphere having ratio of radius 2:1 and ratio of wavelength of radiations of maximum intensity 1:2?
 
{1} 8:1
{2} 27:1
{3} 64:1
{4} 25:1

Asked by Mamali Nanda 19th July 2016, 9:04 PM
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CBSE - XI Science - Physics - Thermal Properties of Matter

1 gram water is vaporised into steam at 100 degree celsius. The work done against atmosphere is?
( Given density of vapour = 1.65 kg/m3)
1. 39.3J
2. 47.2J
3.29.8J
4.17.9J

Asked by Mamali Nanda 19th July 2016, 8:57 PM
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CBSE - XI Science - Physics - Thermal Properties of Matter

IS ther any relation between light and "RADIATION"?  As the velocities of radiation and light are same.

Asked by anjalimishrikotkar 17th January 2016, 1:19 PM
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CBSE - XI Science - Physics - Thermal Properties of Matter

What is thermal conductivity of a perfect heat conductor and a perfect heat insulator?

Asked by Topperlearning User 16th April 2015, 9:37 AM
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CBSE - XI Science - Physics - Thermal Properties of Matter

Find the thermal conductivity of metal of a rod of length 0.5 m and diameter 4 cm. One end of the rod is at 110 °C and the other end is in ice at 0 °C. 15 g of ice melts per minute. (latent heat of ice is 80 cal/ g).

Asked by Topperlearning User 16th April 2015, 9:32 AM
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CBSE - XI Science - Physics - Thermal Properties of Matter

Two Pizzas one at 100 °C and another at 30 °C are kept on a table. Which one would cool off faster and by how many times? Temperature of surroundings is 20 °C.

Asked by Topperlearning User 16th April 2015, 9:27 AM
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CBSE - XI Science - Physics - Thermal Properties of Matter

A wooden plank of 0.025 m is attached to an insulation of 0.075 m. The temperature inside it is 25 ˚C and the outside temperature is 4 ˚C. T is the interface temperature. Take: K(wood)= 0.80 J/s m ˚C, K(insulation)= 0.20 J/s m ˚C. Calculate how much heat energy flows through the wall per second?

Asked by Topperlearning User 15th April 2015, 4:54 PM
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CBSE - XI Science - Physics - Thermal Properties of Matter

What are thermal radiations? Give some of its basic characteristics.

Asked by Topperlearning User 15th April 2015, 4:45 PM
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CBSE - XI Science - Physics - Thermal Properties of Matter

If a liquid is heated from top, then by which mode the transfer of heat would take place?

Asked by Topperlearning User 15th April 2015, 4:41 PM
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CBSE - XI Science - Physics - Thermal Properties of Matter

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 15th April 2015, 4:38 PM
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CBSE - XI Science - Physics - Thermal Properties of Matter

Which of the three modes of transfer of heat is the fastest?

Asked by Topperlearning User 15th April 2015, 4:32 PM
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CBSE - XI Science - Physics - Thermal Properties of Matter

Explain the working of room heater. How can we increase the efficiency of convections in radiator of a room heater?

Asked by Topperlearning User 15th April 2015, 4:28 PM
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CBSE - XI Science - Physics - Thermal Properties of Matter

Why is a new quilt warmer than an old quilt?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XI Science - Physics - Thermal Properties of Matter

By what mode of heat transfer is mercury heated?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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