Heat radiations propagate with the speed of

The spectrum of black body radiation is a ...... .

The sun radiates electromagnetic energy at the rate of $3.9 \times 10^{26} \ W$. Its radius is $6.96 \times 10^8 \ m$. The intensity of sunlight at the solar surface will be (in $W/m^2$):

Good absorbers of heat are

We consider the radiation emitted by the human body,which of the following statements is true?

Which of the following statements is true for a perfectly black body?