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The velocity of heat radiation in vacuum...

The velocity of heat radiation in vacuum is .

A

Equal to that of light

B

Less than that of light

C

Greater than that of light

D

Equal to that of sound

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The correct Answer is:
A
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ERRORLESS -TRANSMISSION OF HEAT-Radiation (General, Kirchoff s law, Black body)
  1. On a clear sunny day, an object at temperature T is placed on the top ...

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  2. The velocity of heat radiation in vacuum is .

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  3. The process in which rate of transfer of heat maximum is .

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  4. Which of the following is the correct device for the detection of ther...

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  5. A thermos flask is polished well

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  6. Heat travels through vaccum by

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  7. The energy supply being cut-off, an electric heater element cools down...

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  8. We consider the radition emitted by the human body which of the follow...

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  9. The earth radiates in the infra-red region of the spectrum. The spectr...

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  10. Infrared radiation is detected by

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  11. Pick out the statement which is not true

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  12. A hot and a cold body are kept in vacuum separated from each other. Wh...

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  13. Good absorbers of heat are

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  14. For a perfectly black body, its absorptive power is

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  15. Certain substance emits only the wavelengths lamda1,lamda2,lamda3 and ...

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  16. Compared to a person with white skin another person with dark skin wil...

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  17. Relation between emissivity e and absorptive power a is (for black bod...

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  18. Which of the following statements is wrong ?

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  19. Half part of ice block is covered with black cloth and rest half is co...

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  20. If between wavelength lambda andlambda + dlambda, e(lambda) and a(lamb...

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