Question

a In a room where temperature is 0°C, two objects A & B are kept. A is a black body at a temperature of 273°C and B is an object of emissivity 0.3 and temperature of 546°C. Both bodies have same area and mass. If spécific heat capacity of A is half that of B, the ratio of initial rates of colling of A and B will be :-​

Answer 1

Answer:

Correct option is A)

The ratio of energy emission will be directly proportional to fourth power of temperature ratio can be found out from given data.

ΔQ

1

ΔQ

2

=

σAT

1

4

σAT

2

4

T

1

=273+273K=546K;T

2

=273K

substituting the temperature values in the Stefan's law

ΔQ

1

ΔQ

2

=

σA546

4

σA273

4

=

2

4

1

⇒ΔQ

2

=

16

ΔQ

1

Thus the correct answer is A.

Explanation:

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