The total energy emitted by a black surface can be calculated from a relationshi

Question

The total energy emitted by a black surface can be calculated from a relationship proportional to the temperature to the 4th power. (a) Always true. (b) Sometimes true. (c) True for specific surface conditions. (d) Only true for the electromagnetic spectrum in the visible range. e) Not true since it the heat transfer rate is always proportional to the 1st power of Surface radiative properties depend on (a) Temperature of the surface. (b) Wave length of radiation (c) Direction of the surface. (d) (a). (b), and (c) (e) (a) and (c).

Explanation / Answer

1 - (a)

The total energy emitted by a black body E = sigma x (T)^4

2 - (d)

Surface radiative properties is determined by emissivity which is dependent on wavelength, temperature and angle of emission of radiation.

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