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The best laboratory approximation to an ...

The best laboratory approximation to an ideal black body is

A

A lump of charcoal heated to high temperature

B

A glass surface coated with coaltar

C

A metal coated with a black dye

D

A hollow enclosure blackened inside with soot and having a small hole

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The correct Answer is:
D
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AAKASH SERIES-THERMAL PROPERTIES OF MATTER-EXERCISE-IA
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  6. A cup of hot tea on a metal table in a room loses heat by

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  7. Fraunhoffer lines in solar spectrum can be cited as an example of

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  8. A sphere, a cube and circular plate of same material and same mass are...

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  9. A Blackbody, a Whitebody, A Bluebody and a Red coloured body are heate...

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  10. Rate of cooling (d theta)/(dt) depends upon

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

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

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  13. If rate of heat loss ((dQ)/(dt)) of two bodies of different masses are...

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  14. Ratio of rate of fall of heat to rate of fall of temperature of a body...

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  15. A beaker full of hot water is kept in a room. It cools from 80^(@)C to...

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  16. Two spheres of radii r(1)andr(2) have densities rho(1)andrho(2) and sp...

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  17. Newton's law of cooling is applicable when

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