The chart lists several regions of the electromagnetic spectrum:
| radio | microwave | infrared | visible light | ultraviolet | x-ray | gamma |
Complete the table by giving one radiation from the chart for each use.
You may give each type of radiation once, more than once, or not at all.
| Use for radiation | Type of radiation |
|---|---|
| Checking bank notes for counterfeiting | |
| Airport security scanners for luggage | |
| Bluetooth short-range device connections |
In a vacuum, all types of electromagnetic radiation travel with
In 1800, the astronomer William Herschel investigated the properties of sunlight.
He passed a beam of sunlight through a triangular glass prism to split it into a spectrum of colors. He then placed thermometers at different positions along the spectrum, as well as in the regions just outside the visible boundaries (marked as Zone X and Zone Y in the diagram below).
Explain why a thermometer placed in Zone X (just past the red end of the visible spectrum) recorded a significant temperature rise, identifying the type of radiation present and comparing its path to that of the visible rays.
In another experiment, a student wants to minimize the rate of thermal energy transfer by radiation from a hot water brass container to its surroundings. Which surface finish on the container would work best at reducing emission?
