Science chapter 27
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Light does not pass through what kind of materials?
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Opaque
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Light waves are
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Transverse waves
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What kind of electromagnetic wave has the shortest wavelength?
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X Rays
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Glass is transparent to visible light, but not to
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Infrared & ultraviolet
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The shadow produced by an object held close to a piece of paper in sunlight will be
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Sharp
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Electromagnetic waves with higher frequencies have wavelengths that are
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Shorter
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What is the frequency of an electromagnetic wave having a wavelength of 300,000km?
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1 Hz
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Compared to the velocity of radio waves, the velocity of visible light waves is
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The same
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Light reflects at glancing angles from nonmetallic surfaces, such as glass, water, or roads is
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Polarized parallel to the surface
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Light reflects from a lake surface is polarized
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Horizontally
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Compared to the wavelength of ultraviolet waves, the wavelength of infrared waves is
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Longer
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If an electron vibrates up and down 1000 times each second, it generates an electromagnetic wave having a
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Frequecy of 1000 Hz
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The main difference between a radio wave and a light wave is its
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Wavelength
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The shiny surfaces of metals have not to do with
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The free electrons in metal atoms
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After randomly polarized light passes through a polarized, it is
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Totally polarized
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The source of all electromagnetic waves is
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Vibrating charged
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The main difference between a radio wave and a sound wave is its
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Basic nature
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Heat lamps give off mostly
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Infrared waves
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How far is a light second
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300,000 km
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The purpose of glasses is to
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Block glare from reflections
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X Rays, radio waves, gamma rays, and light waves are all different from
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Sound waves
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____ is not an electromagnetic wave
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Sound
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Compared to its speed in air, the speed of light in water is
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Slower
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Clouds ____
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Transmit uv light
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What is the ultimate source of electromagnetic waves
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Vibrating charged particles
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Electromagnetic waves
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Can travel through a vacuum
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Polarization occurs when waves vibrate in a single direction.
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True
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Glass transmits ultraviolet and visible light waves but not infrared waves.
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False
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A total shadow is called an umbra.
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True
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Electromagnetic hear waves are called ultraviolet waves.
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False
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According go Einstein, light consists of massless bundles of electromagnetic energy called photons.
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True
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Materials allow light to pass through them in straight lines are called opaque materials.
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False
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A thin beam of light is called an x Ray.
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False
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Light sometimes acts as a wave and sometimes as a particle.
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True
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Infrared waves are responsible for sunburn.
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False
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The distance light travels in one year is called a light year.
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True
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Energy emitted by vibrating electric charges is carried by electromagnetic waves
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True
