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

Surface temperature of the sun is of the order of $K$.

In which of the following phenomena do heat waves travel along straight lines with the speed of light?

$Assertion :$ $A$ body that is a good radiator is also a good absorber of radiation at a given wavelength.
$Reason :$ According to Kirchhoff's law,the absorptivity of a body is equal to its emissivity at a given wavelength.

The black lines in the solar spectrum during a solar eclipse can be explained by

When $170 \text{ J}$ of energy is incident on a surface of a body, $17 \text{ J}$ of energy is reflected by it. If the coefficient of absorption is $0.7$, then the amount of energy transmitted will be (in $\text{ J}$)