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In Fery's blackbody...

In Fery's blackbody

A

Inner surface of inner wall is coated with lamp black and outer surface of outer wall is silver polished

B

Space between the two walls is evacuated to prevent heat losses due to conduction & convection

C

A conical projection is provided on the inner wall opposite to small hole

D

All the above

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The correct Answer is:
D
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AAKASH SERIES-THERMAL PROPERTIES OF MATTER-EXERCISE-IA
  1. The hot water pipes used to heat up the rooms are painted

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  2. A small hole in the wall of an enclosure behaves as

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  3. In Fery's blackbody

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  4. Blackbody Radiation is

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  5. The spectrum of thermal radiation from a blackbody is

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  6. A person with dark skin when compared to a person with white skin will...

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  7. The best laboratory approximation to an ideal black body is

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  8. The bulbs of two identical thermometers A and B are coated, one with l...

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  9. In a Thermos flask, heat losses due to

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  10. A cup of hot tea on a metal table in a room loses heat by

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

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

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

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

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

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

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

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

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

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

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