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A black body of mass 34.38 g and surface...

A black body of mass `34.38` g and surface area `19.2cm^(2)` is at an intial temperature of 400 K. It is allowed to cool inside an evacuated enclosure kept at constant temperature 300 K. The rate of cooling is `0.04^(@)C//s`. The sepcific heat of the body `J kg^(-1)K^(-1)` is
(Stefan's constant, `sigma = 5.73 xx 10^(-8)Wm^(-2)K^(-4))`

A

2800

B

2100

C

1400

D

1200

Text Solution

Verified by Experts

The correct Answer is:
C
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A black body of mass 34.38 g and surface area 19.2 cm^(2) is at an intial temperature of 400 K. It is allowed to cool inside an evacuated enclouse kept at constant temperature 300 K. The rate of cooling is 0.04^(@) C/s. The specific heat of body is (Stefan's constant sigma=5.73xx10^(-8) jm^(-2)K^(-4) )

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A body having a surface area of 50cm^2 radiates 300J of energy per minute at a temperature of 727^(@)C . The emissivity of the body is ( Stefan's constant =5.67xx10^(-8)W//m^2K^4 )

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