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A heater body emits radiation which has ...

A heater body emits radiation which has maximum intensity near the frequency `v_(0)` The emissivity of the material is `0.5` . If the absolute temperature of the body is doubled,

A

(i), (iii)

B

(ii), (iii)

C

(iii), (iv)

D

(i), (ii)

Text Solution

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The correct Answer is:
B
(2) `lambda T =` constant
`(c )/(upsilon) T =` constant
`(T)/(upsilon_(0)) = (2T)/(upsilon) implies upsilon = 2 upsilon_(0)`
`(u')/(u) = ((2T)/(T))^(4) = 16`
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CP SINGH-HEAT TRANSFER-Exercises
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  2. The sun radiates energy in all directions. The average radiations rece...

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  3. Newton's law of cooling is a special case of .

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  8. A liquid in a beaker has temperature theta(t) at time t and theta0 is ...

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  9. A hot liquid is kept in a big room. The logarithm of the numerical val...

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  10. Two solid spheres of radii R(1) and R(2) are made of the same material...

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  11. In previous problem, the ratio of the initial rates of cooling (i.e., ...

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  12. Relation between the colour and the temperature of a star in given by

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  13. A black body has maximum wavelength lambda(m) at temperature 2000 K. I...

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

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  15. The plots of intensity versus wavelength for three black bodies at tem...

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  16. A black body is at a temperature of 2800K The energy of radiation emit...

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  17. The power radiated by a black body is P and it radiates maximum energy...

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  18. A heater body emits radiation which has maximum intensity near the fre...

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  19. Three discs, A, B and C having radii 2m, 4m and6m respectively are coa...

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  20. Make the pairs {:(A.,"Thermal conductivity",(i),ML T^(-3)K^(-1)),(B....

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