Let's sum up what you have learned, Choose the correct term from the enclosed choices that should go into the blank spaces. Radio/television signals, GPS and MRI are practical applications of (1) (radio wave/microwave). Satellite communication, cooking, terrestrial communication, and RADAR make use of (2) (infrared/microwave). Remote controls, thermal imaging and night vision goggles are practical applications of (3). around you because of (4). in optical fibers, artificial lights and screens of electronic devices. Vitamin D is produced from (5) _ _(infrared/ultraviotet). You can see things (gamma rays/visible light) which is aiso used (ultraviolet /microwave), which is also used for security markings and sterilization of water in drinking fountains. In diagnosing bone fractures, we use (6)_ (gamma rays/X-rays). _(long wavelength X-ray)/short wavelength X-ray)) is a type of x-ray that can _(long wavelength X- (7) penetrate the flesh while (8). ray)/short wavelength X-ray)) can penetrate through metals. Treating tumors and cancer through the process called radiotherapy and sterilizing medical equipment are practical applications of (9) L(gamma rays/ultraviolet). The effect of Electromagnetic waves on organisms and environment depends on how much (10) _(wavelength, energy) it carries. 13

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.