Gamma Question Bank for Medical Physics>Chapter 11 - Thermal Properties of Matter>Assignment>Q 31

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A cylinder of radius $R$ , made of a material of thermal conductivity $K_{1}$ , is surrounded by a cylindrical shell of inner radius $R$ and outer radius $2 R$ made of a material of thermal conductivity $K_{2}$ . The two ends of combined system are maintained at two different temperatures. If there is no loss of heat across cylindrical surface and the system is in steady state then, calculate the effective thermal conductivity of the system.

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Important Questions on Thermal Properties of Matter

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Gamma Question Bank for Medical Physics>Chapter 11 - Thermal Properties of Matter>Assignment>Q 34

In gravity free space heat transfer is not possible by

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Gamma Question Bank for Medical Physics>Chapter 11 - Thermal Properties of Matter>Assignment>Q 36

A polished metal plate with a rough black spot on it is heated to high temperature and quickly taken into a dark room. Then

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Gamma Question Bank for Medical Physics>Chapter 11 - Thermal Properties of Matter>Assignment>Q 41

A black body, which is at a high temperature

T K

, thermal radiation emitted at the rate of

E W m^{- 2}

. If the temperature falls to

\frac{T}{4} K

, the thermal radiation emitted in

W m^{- 2}

will be

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Gamma Question Bank for Medical Physics>Chapter 11 - Thermal Properties of Matter>Assignment>Q 42

A sphere, a cube and a thin circular plate, all made of the same mass and finish are heated to a temperature of

200 ° C

. Which of these objects will cool slowest, when left in air at room temperature?

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Gamma Question Bank for Medical Physics>Chapter 11 - Thermal Properties of Matter>Assignment>Q 1

Steam is passed through

40 g

of ice at

- 10 ° C

till temperature of mixture becomes

80 ° C

. Mass of mixture will be approximately

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Gamma Question Bank for Medical Physics>Chapter 11 - Thermal Properties of Matter>Assignment>Q 2

The temperature at which Fahrenheit reading is five times of Celsius reading is

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Gamma Question Bank for Medical Physics>Chapter 11 - Thermal Properties of Matter>Assignment>Q 3

It takes

10

minutes to cool a liquid from

65 °

to

55 ° C

. If room temperature is

30 ° C

then time taken in cooling from

51 °

to

49 ° C

is

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Gamma Question Bank for Medical Physics>Chapter 11 - Thermal Properties of Matter>Assignment>Q 4

The Wein's displacement law express, the relation between