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A black body radiates 20 W at temperatur...

A black body radiates 20 W at temperature `227^(@)C`. If temperature of the black body is changed to `727^(@)C` then its radiating power wil be

A

`10 cals^(-1)`

B

`80 cals^(-1)`

C

`160cals^(-1)`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
C
As, `E proptoT^(4)`,
`T_(1) = 500 K` and `T_(2)=1000K rArr T_(2) = 2T_(1)`
`therefore E_(2) = (2)^(4) E_(1) = 16E_(1) = 160 cals^(-1)`
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DC PANDEY-CALORIMETRY AND HEAT TRANSFER-Check points 16.4
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  2. A body, which emits radiations of all possible wavelengths, is known a...

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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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