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The outer faces of a rectangular slab made of equal thickness of iron and brass are maintained at 100°C and 0°C respectively. The temperature at the interface is
(Thermal conductivity of iron and brass are 0.2 and 0.3 respectively.)

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Important Questions on Thermal Properties of Matter

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Gamma Question Bank for Engineering Physics>Chapter 10 - Thermal Properties of Matter>Assignment>Q 39
A hot and a cold body are kept in vacuum separated from each other. Which of the following causes decrease in temperature of the hot body?
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Gamma Question Bank for Engineering Physics>Chapter 10 - Thermal Properties of Matter>Assignment>Q 40
According to Newton's law of cooling, the rate of cooling of a body is proportional to:
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Gamma Question Bank for Engineering Physics>Chapter 10 - Thermal Properties of Matter>Assignment>Q 41
A liquid cools down from 70°C to 60°C in 5 minutes. The time taken to cool it from 60°C to 50°C will be
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Gamma Question Bank for Engineering Physics>Chapter 10 - Thermal Properties of Matter>Assignment>Q 42
If a metallic sphere gets cooled from 62°C to 50°C in 10 minutes and in the next 10 minutes gets cooled to 42°C, then the temperature of the surroundings is
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Gamma Question Bank for Engineering Physics>Chapter 10 - Thermal Properties of Matter>Assignment>Q 43
Newton's law of cooling is used in laboratory for the determination of the
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Gamma Question Bank for Engineering Physics>Chapter 10 - Thermal Properties of Matter>Assignment>Q 44
The excess temperature of a body falls from 12°C to 6°C in 5 minutes, then the time to fall the excess temperature from 6°C to 3°C is (assume the Newton's cooling is valid)
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Gamma Question Bank for Engineering Physics>Chapter 10 - Thermal Properties of Matter>Assignment>Q 45
Emissive power of an ideal black body at 127°C is E. The temperature at which it increases to 102% is
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Gamma Question Bank for Engineering Physics>Chapter 10 - Thermal Properties of Matter>Assignment>Q 46

The plots of intensity versus wavelength for three black bodies at temperatures T1,T2 and T3 respectively are as shown. Their temperature is such that

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