Name: __________________________________________ Class: ________ Date: ________ Information in Radio Waves Unit: Pre-Test Part 1: Matching 1.)___ Frequency a- Longest wavelengths of light, commonly emitted from pulsars. 2.)___ Wavelength b- The initial angle of a sinusoidal wave at its origin. 3.)___ Phase c- The entire collection of possible frequencies and wavelength of light. 4.)___ Polarization d- Shortest wavelengths of light and the most energetic. 5.)___ Electromagnetic Spectrum e- Measured in cycles per second, refers to the total number of waves to pass a given point in a second. 6.)___ Visible light f- Narrow band of radiation between 400 nm and 700 nm. 7.)___ Gamma g- Just outside our field of vision, this type of light is used for ‘heat vision’. 8.)___ Radio h- Just outside our field of vision, this type of light is damaging to genetic material. 9.)___ Infrared i- Measured in meters, it is the distance from one crest of a wave to the next crest. 10.)___ Ultraviolet j- Orientation of a sinusoidal wave determined by the electric field’s direction. Can be linear, circular, or elliptical. Part 2: Short Answer 1.) What does AM and FM mean? What is the difference between the two? 2.) What is the difference between light waves and sound waves? 3.) Describe the four basic characteristics of light waves. 4.) How can information be encoded into a radio wave? What kinds of information can be extracted from radio waves? 5.) What is Geodesy? How does this field of study use radio waves? 6.) Describe how GPS works. 7.) How do solar outbursts affect the Earth? 8.) What is spectroscopy? How does it work? 9.) Why is Hydrogen’s radio signature useful for astronomers? 10.) How do astronomers make pictures using radio waves?