Why is light called electromagnetic radiation?
Light is known as electromagnetic radiation because it has two complementary components which were found to be a magnetic field wave in synchronous motion with an electric field wave. 6. What is the Doppler shift? A Doppler shift is the change in a wave’s wavelegnth caused by the motion of the source relative to that of the observer. The Doppler shift can be easily detected in sound by the ear. An example is when a car honks its horn while approaching you. While approaching the tone will be higher than the actual tone. When the car is opposite you the tone will be its actual value. As the car moves away the tone will be lower (see figure 3-18 in text). The Doppler shift can be calculated using this formula: 7. What gases in the atmosphere absorb infrared radiation? Which gases absorb ultraviolet? Some of the gases found in our atmosphere which absorb infrared light are: carbon dioxide, methane, and water vapor. Gases found in our atmosphere which absorb ultraviolet light are ozone (O3)
