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Three objects coloured black, gray and w...

Three objects coloured black, gray and white can withstand hostile conditions upto `2800^(@)C`. These objects are thrown into a furance where each of them attains a temperature of `2000^(@)C`. Which object will glow brightest?

A

The white object

B

The black object

C

All glow with equal brightness

D

Gray object

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The correct Answer is:
B
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MOTION-HEAT TRANSFER & THERMAL EXPANSION -Exercise - 3 Section-A
  1. A black body emits radiations of maximum intensity at a wavelength of ...

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

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  3. On a new scale of temperature (which is linear) and called the W scale...

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  4. The two ends of a rod of length L and a uniform cross-sectional area A...

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  5. A black body at 227^(@)C radiates heat at the rate of 7 cal cm^(-2) s...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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