An aerospace engineer is testing different surface finishes for a satellite's passive thermal control radiator panel.
A test plate is divided into four quadrants, each with a different surface finish: matt black, shiny black, matt white, and polished silver. The plate is heated uniformly to a constant temperature of 120∘C120^\circ\text{C}120∘C inside a vacuum chamber.
An infrared radiometer probe positioned at a fixed distance is used to measure the intensity of the thermal radiation emitted from each quadrant.
The table below shows the radiometer readings for three of the surface finishes.
| Surface finish | Radiometer reading (W m−2\text{W m}^{-2}W m−2) |
|---|---|
| Matt black | 240 |
| Shiny black | |
| Matt white | 135 |
| Polished silver | 18 |
Suggest a possible radiometer reading for the shiny black surface.