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An ideal black-body at room temperature is thrown into a furnace. It is observed that

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Important Questions on Kinetic Theory of Gases and Radiation

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Physics Crash Course MHT-CET>Chapter 12 - Kinetic Theory of Gases and Radiation>Exercise 1>Q 119

A black pattern on a porcelain bowl appears brighter than the rest of bowl, when it is strongly heated and taken to a dark room. This is an illustration of

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Physics Crash Course MHT-CET>Chapter 12 - Kinetic Theory of Gases and Radiation>Exercise 1>Q 120
According to Kirchhoff's law-
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Physics Crash Course MHT-CET>Chapter 12 - Kinetic Theory of Gases and Radiation>Exercise 1>Q 121
In solar spectrum fraunhoffer's lines are presents because:
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Physics Crash Course MHT-CET>Chapter 12 - Kinetic Theory of Gases and Radiation>Exercise 1>Q 122

Three objects coloured black, grey and white can withstand hostile conditions up to 2800 °C. These objects are thrown into a furnace where each of them attains a temperature of 2000 °C. Which object will glow brightest? 

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Physics Crash Course MHT-CET>Chapter 12 - Kinetic Theory of Gases and Radiation>Exercise 1>Q 123
Good absorbers of heat are
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Physics Crash Course MHT-CET>Chapter 12 - Kinetic Theory of Gases and Radiation>Exercise 1>Q 127
The filament of an evacuated light bulb has a length 10 cm, diameter 0.2 mm and emissivity 0.2, calculate the power it radiates at 2000 K σ=5.67×10-8 W m-2 K-4. 
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Physics Crash Course MHT-CET>Chapter 12 - Kinetic Theory of Gases and Radiation>Exercise 1>Q 128
The temperature of two bodies A and B are respectively 727°C  and 327°C, the ratio of the rates of heat radiated HA:HB by them, is
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Physics Crash Course MHT-CET>Chapter 12 - Kinetic Theory of Gases and Radiation>Exercise 1>Q 129
The ratio of radiant energies radiated per unit surface area by two bodies is 16: 1, the temperature of hotter body is 1000 K, then the temperature of colder body will be