IPC 1B - Lesson Nine: Electromagnetic Waves and Light
Microwaves are a type of...
Radio Wave.
Explain The Law of Reflection.
The angle at which a light wave strikes a surface is the same as the angle at which it is reflected.
Shadows can be explained by the fact that light travels as...
Waves.
Which of the following does not belong? A, X-rays. B, Sound waves. C, Gamma Rays. D, Radio Waves.
B, Sound Waves.
A lens that causes light to converge is...
Convex.
A three-dimensional image is called a...
Hologram
Which of the following is used to reflect light? A, Mirror. B, Lens. C, Fluorescent Tube. D, Prism.
A, Mirror.
The bouncing of light off an object that has an irregular surface is called...
Diffuse Reflection.
Light waves are...
Electric and magnetic. Because Light waves are Electromagnetic Waves.
"The invisible spectrum contains all the colors of the rainbow," true or false?
False.
The electromagnetic spectrum arranges waves in order of...
Frequency and wavelength.
The waves with the highest energy in the electromagnetic spectrum are...
Gamma Rays.
A concave mirror...
Has a surface that curves inward, like a the bowl of a spoon.
The light waves produced by a laser are...
Of the same frequency. Of the same color. In phase.
A long, thin, flexible length of glass or plastic used to transfer light is called an...
Optical Fiber.
"A lens that is thicker at the ends than in the middle is a concave lens," true or false?
True.
"Electromagnetic waves are longitudinal waves," true or false?
True.
"Microwaves are used for communication in cellular or portable phones," true or false?
True.
"Optical fibers are replacing electric wires in communications systems such as telephone systems," true or false?
True.
"Some sunglasses use polarized lenses to cause light to vibrate along a single plane," true or false?
True.
Waves with frequencies slightly higher than those of visible light are...
Ultraviolet Rays
"Ultraviolet rays can be felt as heat," true or false?
False.
"Ultraviolet waves are used to locate objects and monitor speed," true or false?
False.
"When the three primary pigments are mixed in equal amounts, the resulting color is white," true or false?
False. The 3 primary colors of pigments appear to be black when they're mixed.
Light produced by electron bombardment of low-pressure gases is...
Fluorescent.
The point in front of a mirror where reflected rays meet is the...
Focal Point.
The speed of light in a vacuum is approximately ______ km/sec.
300,000 km/sec. "All electromagnetic waves travel at 300,000 km/sec in the vacuum of space."
Light produced from heat is called...
Incandescent. "Incandescent light is generated by heating a piece of metal until it glows..."
Thermograms are produced using...
Infrared Rays.
Waves with frequencies slightly lower than those of visible light are called...
Infrared Rays.
Electromagnetic waves can behave like what type of particle?
Photons.
An object that readily transmits light without distorting the images of objects seen through it is...
Transparent.
