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A piece of iron is heated in a flame. It...

A piece of iron is heated in a flame. It first becomes dull red then becomes reddish yellow and finally turns to white hot. The correct explanation for the above observation is possible by using.

A

Newton’s Law of cooling

B

Stefan’s Law

C

Wein’s displacement Law

D

Kirchoff’s Law

Text Solution

Verified by Experts

The correct Answer is:
C
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MOTION-HEAT TRANSFER & THERMAL EXPANSION -Exercise - 3 Section-A
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  4. A black body at 227^(@)C radiates heat at the rate of 7 cal cm^(-2) s...

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  5. A cylindrical metallic rod in thermal contact with two reservoirs of h...

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  6. The total radiant energy per unit area, normal to the direction of inc...

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  7. A slab of stone of area of 0.36 m^(2) and thickness 0.1 m is exposed o...

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  8. If the radius of a star is R and it acts as a black body, what would b...

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  9. Assertion (A) A thermocouple refrigerator is based on the Peltier effe...

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  10. A piece of iron is heated in a flame. It first becomes dull red then b...

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  11. Two stars A and B of surface area Sa and Sb & temperature Ta and Tb gl...

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  12. Certain quantity of water cools from 70^(@)C to 60^(@)C in the first 5...

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  13. The two ends of a metal rod are maintained at temperatures 100^(@)C an...

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  14. On observing light from three different stars P, Q and R, it was found...

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  15. The value of coefficient of volume expansion of glycerin is 5 xx 10^(-...

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  16. A body cool from 90^@C to 70^@C in 10 minutes if temperature of surrou...

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  17. A black body is at a temperature of 5760 K. The energy of radiation em...

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  18. Coefficient of liner expansion of brass and steel rods are alpha(1) an...

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  19. Two rods A and B of different materials are welded together as shown i...

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  20. The bulk modulus of a spherical object is B if it is subjected to unif...

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