Physical Science 18.2 The Electromagnetic Spectrum Reading Guide List the types of electromagnetic radiation from lowest frequency to highest frequency. Describe two technological uses of radio waves. Explain how a microwave heats up food. What does RADAR stand for? Contrast the wavelength and frequencies radio waves and infrared rays. List the colors of the visible light spectrum from longest to shortest wavelength. List two applications UV rays have in health and medicine. Contrast the energy carried by x-rays and ultraviolet rays. Describe the wavelength and frequency of gamma rays.

18.1 Electromagnetic Waves Reading Guide What are electromagnetic waves? How are they made? How do they travel? What is the transfer of energy by EM waves through space called? 5. What is the speed of light? 6. What happens to the wavelength EM waves if the frequency goes up? 7. Describe the feature of light that are wavelike. 8. Describe the feature of light that are particle like. 9. Describe what happens to intensity as distance increases from the source of EM radiation.

18.3 Behavior of Light Reading Guide How is an opaque object different from a transparent object? Give an example of something translucent. What three things can happen to light when it strikes an object? What causes a false distorted image to form on a hot day? 5. Explain how polarizing filters block light. 6. Why is the sky red at sunrise and sunset?

18.3 Quiz Form A Define Opaque. Define Luminous. Explain why the sky is red at sunrise and sunset. Give an example of something translucent. Form B Define Transparent. Define illuminated. Explain how polarizing lenses work. Give an example of something opaque.

18.4 Color Reading Guide How do rainbows form? Why is a red car, red? How are pigment and light different? What is the relationship between the primary colors of pigment and the secondary colors of light?

18.5 Sources of Light Reading Guide Give an example of a luminous object. How does an incandescent light bulb work? What happens during flurescence? What does LASER stand for? 5. How are the different colors of neon lights made?