Question

If the surface temperature of that person's skin is 30∘C (that's a little lower than healthy internal body temperature because your skin is usually a little colder than your insides), what is the total power that person will radiate? For now, assume the person is a perfect blackbody (so ϵ=1).

Answer 1

`E=477.92\ W.m^(-2)`

Step-by-step explanation:

Given that:

Absolute temperature of the body,
`T=273+30=303\ K`

• emissivity of the body,
  `\epsilon=1`

Using Stefan Boltzmann Law of thermal radiation:

`E=\epsilon. \sigma.T^4`

where:

`\sigma =5.67* 10^(-8)\ W.m^(-2).K^(-4)` (Stefan Boltzmann constant)

Now putting the respective values:

`E=1* 5.67* 10^(-8)* 303^4`

`E=477.92\ W.m^(-2)`