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Two rods having thermal conductivity in the ratio of 5 : 3 having equal lengths and equal cross-sectional area are joined by face to face. If the temperature of the free end of the first rod is `100^(@)C` and free end of the second rod is `20^(@)C` . Then temperature of the junction is

A

`50^@C`

B

`70^@C`

C

`60^@C`

D

`90^@C`

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SL ARORA-Thermal Properties of Matter-Exercise
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  2. The ratio of thermal conductivity of two rods of different material is...

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  3. Two rods having thermal conductivity in the ratio of 5 : 3 having equa...

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  4. Three rods of same dimensions have thermal conductivities 3K, 2k and K...

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  5. Mud houses are cooler in summer and warmer in winter because

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  6. PERFECTLY BLACK BODY

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  7. Three objects coloured black, gray and white can withstand hostile con...

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  8. The rate of cooling at 600 K, if surrounding temperature is 300 K is R...

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  9. A body initially at 80^(@)C cools to 64^(@)C in 5 minutes and to 52^(@...

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  10. The temperature of a room heated by heater is 20^@C when outside tempe...

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  11. Emissive power of a perfectly black body

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  12. Which of the following statements is wrong ?

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  13. Unit of Stefan's constant is

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  14. Two bodies are at temperature 27^(@) and 927^(@)C. The heat energy rad...

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  15. A black body radiates energy at the rate of 1 xx 10^(5) J // s xx m at...

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  16. Temperature of a black body increases from 327^(@)C to 927^(@)C, the ...

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  17. Two identical metal balls at temperature 200^(@)C and 400^(@)C kept in...

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  18. A body at a temperature of 727^(@)C and having surface area 5 cm^(2), ...

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  19. The surface temperature of the sun is 'T'K and the solar constant for ...

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  20. A piece of blue glass heated to a high temperature and a piece of red ...

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