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Radius of a shere is R density is d and ...

Radius of a shere is `R` density is d and specific heat is s, Is is heated and then allowed to cool Its rate of decrease of temperature will be proportional to .

A

Rds

B

1/Rds

C

`1//R^(-1)ds`

D

`R^2ds`

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The correct Answer is:
B
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MOTION-HEAT TRANSFER & THERMAL EXPANSION -EXERCISE - 1
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  2. The effective area of a black body is 0.1 m^2 and its temperature is 1...

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  3. Radius of a shere is R density is d and specific heat is s, Is is heat...

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  4. If a body at 27^(@)C emits 0.3 watt of heat then at 627^(@)C, it will ...

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  5. The rate of cooling of a body depends on –

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  6. A solid sphere, a cube and a plate, all are made of same material and ...

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  7. Consider two hot bodies B(1) and B(2) which have temperature 100^(@)"C...

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  8. According to Newton’s law of cooling ms (d theta)/(dt)=-K(theta-theta0...

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  9. is temperature of surroundings in K, then the value of K on the basis ...

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  10. A body takes, 4 minutes to cool from 100^(@)C to 70^(@)C, if the room ...

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  11. When placed in air at 30^(@)C, the temperature of a body decreases fro...

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  12. Frequency for maximum energy radiation of ideal black body at tempertu...

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  13. The wavelength of maximum emitted energy of a body at 700 K is 4.08 mu...

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  14. The spectral emissive power of a black body at a temperature of 6000K ...

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  15. Temperature of an ordinary bulb is 3000^@K. At what wave length will i...

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  16. If for a black body the graph of change is emissive power at different...

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  17. An iron ball is heated. The percentage increase will be the largest in...

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  18. Two holes of unequal diameters d(1) and d(2)(d(1)gt d(2)) are cut in m...

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  19. Two rods of length l(1) and l(2) are made of material whose coefficien...

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  20. A metallic bar is heated from 0^(@)C to 100^(@)C. The coefficient of l...

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