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Module 15
Module 15
| Question | Answer |
|---|---|
| Electromagnetic wave | A transverse wave composed of an oscillating electric field and a magnetic field that oscillates perpendicular to the electric field |
| The Law of Reflection | The angle of reflection equals the angle of incidence. |
| Wave theory of light | Views light as two transverse waves, one made of an oscillating magnetic field and the other as an oscillating electric field. |
| Particle theory of light | views a ray of light as a beam of individual particles called photons. |
| Quantum-mechanical theory of light | says that light is both a particle and a wave. It is made up of individual packets that behave like particles, but the packet is actually made up of a wave. |
| Sound waves cause air to oscillate. What do light waves oscillate? | Light waves oscillate a magnetic field and an electric field. Each one oscillates perpendicular to the other, as well as perpendicular to the direction of travel. |
| What does Einstein's Special Theory of Relativity say about the speed of light? | says nothing with mass can travel faster than the speed of light. |
| Light is traveling through water and suddenly breaks the surface and travels through air. Did light's speed increase, decrease, or stay the same once it left the water? | Unlike sound, light travels slower in liquids than gases. Thus, the light's speed increased once it left the water. |
| Order the following colors in terms of increasing wavelength: orange, violet, yellow, green. List the color corresponding the the smallest wavelength first and end with the color that corresponds to the longest wavelength. | Acronym ROY G. BIV. Red longest - violet shortest. So - violet, green, yellow and orange. |
| List in increasing frequency - orange, violet, yellow, green. Start with the lowest frequency and end with highest. | orange, yellow, green and violet |
| Do radio waves have higher or lower frequencies than visible light? What about X-rays? | Radio waves have lower frequencies than visible light, while X-rays have higher frequencies. |
| Infrared light is given off by any object that is losing heat. The human body is almost always losing heat to the environment. Why, then, don't human bodies glow at night, since they are emitting light? | Infrared light is not visible. |
| Light hits a mirror, making an angle of 15 degrees relative to a line drawn perpendicular to the mirror's surface. What angle does the reflected light make with the same line? | The reflected light also makes a 15 degree angle relative to that line. |
| In the diagram in #11, will the man see his foot, despite the fact that the mirror does not reach the ground? | Yes, light must be able to travel from that part of his body, reflect off the mirror, and hit his eye. His brain will extend that line backwards, forming an image in the mirror. Law of reflection. |
| When light travels from one substance to another, what two things can happen to the direction of the light ray's travel? | The light ray can be reflected or refracted. |
| In a physics experiment, a light ray is examined as it travels from air into glass. If the angle that the light ray makes with a line perpendicular to the glass surface is measured, will the refracted ray bend toward or away from that line? | The light will bend toward the perpendicular line. |
| When you look at objects underwater from above the water, they appear to be at a different position than their actual position. Why? | When light travels from water to air, it bends. This causes your mind to form a false image of the object in a slightly difference location. |
| In order for you to see a rainbow. what three conditions must be met? | There must be water droplets suspended in the air, the sun must be shining on them from behind you, and the sun must be at a certain angle (or height in the sky). |
| What is the difference between a converging lens and a diverging lens? | A converging lens causes light rays to bend so that they converge to a single point. Diverging lenses cause light rays to bend away from each other. |
| What do the difference lens' look like? | The function of a lens depends on its shape. The more oval lens is a converging lens and the lens that looks like a spool is a diverging lens. |
| What is special about the way the eye focuses light as compared to the way a camera focuses light? | The eye focuses light by changing the shape of its lens. A camera focuses light by moving the position of the lens. |
| Suppose the cone cells on your retina that sense red light no longer work. If you look at a white piece of paper, what color would it appear to be? If you look at a red piece of paper, what color would it appear to be? | The white paper would appear to be blue-green or cyan. The red paper would appear to be black - or a grayish image. |
| A shirt is dyed so that it looks violet. What colors of light does the dye absorb? | In order to look violet, it must absorb all colors except violet. Thus, it absorbs red, yellow, orange, green, blue, and indigo light. |
| A cyan dye is made of a mixture of substances that absorb all light colors except blue and green. If you took a cyan piece of paper and placed it in a dark room and shined red light on it. what would you see? How about if you shined green on it? | In red light, the paper would look black. In green light, the paper would look green. |
Created by:
davisjuring
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