Thermal conductivity of a rod of length l and uniform cross section area A varies with temperature as K = K 0 a + b T ,where K 0 and a and b are constants. The temperature of two ends of rod are T 1 & T 2 . Find the rate of flow of heat across the rod

AK 0 b l ⁡ ln a + bT 1 a + bT 2

AK 0 b l ⁡ ln a + bT 2 a + bT 1

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The solar constant on the surface of the earth is $S$ . What will be its value on the surface of another planet which is about $5.3 AU$ away from sun?

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Important Questions on Thermal Properties of Matter

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IMPORTANT

Physics Crash Course JEE Main>Chapter 8 - Thermal Properties of Matter>Level 1>Q 21

Three rods of same dimensions have thermal conductivities

3 K

2 K

and

K

, with their ends at

100 ° C

50 ° C

and

0 ° C

respectively. They are arranged as shown in the diagram. The temperature of the junction

J

in steady-state is:
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Physics Crash Course JEE Main>Chapter 8 - Thermal Properties of Matter>Level 1>Q 22

Six identical conducting rods are joined as shown in the figure. Points

A

and

D

are maintained at

200^{o} C

and

20^{o} C

, respectively. The temperature of junction

B

will be

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Physics Crash Course JEE Main>Chapter 8 - Thermal Properties of Matter>Level 1>Q 23

Thermal conductivity of a rod of length l and uniform cross section area A varies with temperature as $K = \frac{K_{0}}{a + b T}$ ,where $K_{0}$ and a and b are constants. The temperature of two ends of rod are $T_{1} & T_{2}$ . Find the rate of flow of heat across the rod

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Physics Crash Course JEE Main>Chapter 8 - Thermal Properties of Matter>Level 1>Q 24

Rate of heat conduction through a window is

1000 W

, when the inside temperature is

10 ° C

and the outside temperature is

- 10 ° C

. Same heat will be conducted through the window when the outside temperature is

- 23 ° C

and inside temperature is:

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Physics Crash Course JEE Main>Chapter 8 - Thermal Properties of Matter>Level 1>Q 25

The power radiated by a black body is

P

, and it radiates maximum energy around the wavelength

λ_{0}

. If the temperature of the black body is now changed, so that, it radiates maximum energy around a wavelength

\frac{3 λ_{0}}{4}

, the power radiated by it will increase by a factor of

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Physics Crash Course JEE Main>Chapter 8 - Thermal Properties of Matter>Level 1>Q 26

A clock, which keeps correct time at

25 ° C

, has a pendulum made of brass. The coefficient of linear expansion for brass is

0.000019 ° C^{- 1}

. How many seconds will it gain in

2

days if the ambient temperature falls to

0 ° C

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Physics Crash Course JEE Main>Chapter 8 - Thermal Properties of Matter>Level 1>Q 27

A non-isotropic solid metal cube has coefficients of linear expansion as :

5 \times 10^{- 5} / {}^{\circ}C

along the X-axis and

5 \times 10^{- 6} / {}^{\circ}C

along the

y

and the

z

-axis. If the coefficient of volume expansion of the solid is

C \times 10^{- 6} / {}^{\circ}C

then the value

C

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Physics Crash Course JEE Main>Chapter 8 - Thermal Properties of Matter>Level 1>Q 28

If the length of a cylinder on heating increases by

2 %,

the area of its base will increase by:

The solar constant on the surface of the earth is S. What will be its value on the surface of another planet which is about 5.3 AU away from sun?

Important Questions on Thermal Properties of Matter

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The solar constant on the surface of the earth is $S$ . What will be its value on the surface of another planet which is about $5.3 AU$ away from sun?