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The area of a hole of heat furnace is 10...

The area of a hole of heat furnace is `10^(-4)m^(2)`. It radiates `1.58xx10^(5)` calories of heat per hour. If the emissivity of the furnace is 0.80, then its temperature is

A

1500 K

B

2000 K

C

2500 K

D

3000 K

Text Solution

Verified by Experts

The correct Answer is:
C
According to Stefan's law, `E=sigmaomegaAT^(4)`
`rArr (1.58 xx 10^(5) xx 4.2)/(60 xx 60)` = `5.67 xx 10^(-8) xx 10^(-4) xx 0.8 xx T^(4)`
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DC PANDEY-CALORIMETRY AND HEAT TRANSFER-Check points 16.4
  1. A hot and a cold body are kept in vacuum separated from each other. Wh...

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  2. A body, which emits radiations of all possible wavelengths, is known a...

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  3. Distribution of energy in the spectrum of a black body can be correctl...

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  4. Which of the following law states that "good absorbers of heat are goo...

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  5. The ratio of the pressure power to the absorption power of all substan...

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

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  7. There is a black spot on a body. If the body is heated and carried in ...

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  8. In MKS system, Stefan's constant is denoted by sigma. In CGS system mu...

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  9. A black body radiates 20 W at temperature 227^(@)C. If temperature of ...

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  10. Two spherical black bodies of radii R(1) and R(2) and with surface tem...

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  11. A sphere has a surface area of 1.0 m^(2) and a temperature of 400 K an...

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  12. Two spheres of the same material have radii 1m and 4m and temperatures...

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  13. The area of a hole of heat furnace is 10^(-4)m^(2). It radiates 1.58xx...

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  14. If a body cools down from 80^(@) Cto 60^(@) C in 10 min when the tempe...

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  15. A block of metal is heated to a temperature much higher than the room ...

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  16. If wavelengths of maximum intensity of radiations emitted by the sun a...

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  17. The maximum wavelength of radiation emitted at 200 K is 4 μm. What wil...

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  18. The maximum energy in thermal radiation from a source occurs at the wa...

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  19. The intensity of radiation emitted by the sun has its maximum value at...

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  20. In the figure, the distribution of energy density of the radiation emi...

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