Question

At what temperature a body will not radiate any heat energy?
a) 0o C
b) 273o Cc) 100o C
d) -273o C

Answer 1

answer : option (d) - 273°C

explanation : formula of radiation heat transfer is given by , $\frac{dQ}{dt}=\sigma eAT^4$

where $\sigma$ is Stefan's constant, e is emissivity, A is cross sectional area and T is temperature in Kelvin.

now, you can say me when radiation heat transfer will be zero or will not radiate any amount of heat energy ?

of course ! when Temperature of body in kelvin will be zero.

e.g., T = 0K

we know, relation between Kevin and Celsius e.g., K = 273 + C

or, 0 = 273 + C => C = -273°C

hence, option (d) is correct.

Answer 2

Answer:

Explanation:

-273°C