Test: Solar Absorptivity - Mechanical Engineering MCQ

Solar absorptivity for asphalt is 0.90 while that of white marble, concrete and snow are 0.46, 0.60 and 0.28 respectively.

Solar absorptivity doesn’t require a medium and for aluminum it reaches maximum efficiency in a vacuum.

Solar absorptivity for polished copper depends on frequency and wavelength of the radiation.

Solar absorptivity for polished aluminum is 0.09 while that of red brick, aluminum foil and snow are 0.63, 0.15 and 0.28 respectively.

There is vibration within the molecules and it can potentially initiate an electromagnetic waves.

Solar absorptivity for white marble is 0.46 while that of black paint, dull stainless steel and concrete are 0.97, 0.50 and 0.60 respectively.

It generates and receive electromagnetic waves at the expense of its stored energy.

Emissivity of black paint is 0.97 while that of red brick, asphalt and white paint are 0.63, 0.90 and 0.14 respectively.

Energy emitted by asphalt is not continuous but is in the form of quanta.

Solar absorptivity for snow varies on the nature of its surface and its temperature.