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Chapter 27: Light Questions
Chapter 27: Light Questions
26
Physics
11th Grade
01/07/2012

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Term
Name the alignment of vibrations in a transverse wave, usually by filtering out waves of other directions.
Definition
Polarization
Term
Light travels in ______________________ waves.
Definition
transverse
Term
Name the darker part of a shadow where all the light is blocked.
Definition
umbra
Term
Name a partial shadow that appears where light from part of the source is blocked and light from another part of the source is not blocked.
Definition
penumbra
Term
A thin beam of light is called a __________________.
Definition
ray
Term
A shaded region that results when light falls on an object and thus cannot reach into the region on the far side of the object.
Definition
shadow
Term
If a material absorbs light without reemission they are ___________
Definition
opaque
Term
If visible light passes through glass, why does glass get hot in sunlight?
Definition
It absorbs ultraviolet light.
Term
Why is the average speed of light lower in water or glass than in a vacuum?
Definition
There is a time delay in the absorption and reemission of the light by the particles in the medium.
Term
Name the term applied to materials that allow light to pass through them in straight lines.
Definition
transparent
Term
Light has a speed of 300,000 km/s in a ______________________.
Definition
vacuum
Term
Light speed is lower than 300,000 km/s in ______________________.
Definition
matter
Term
Light is energy that travels in _____________________________ waves within a certain range of frequencies
Definition
electromagnetic
Term
_____________ is produced by vibrating electric charges in atoms.
Definition
Light
Term
Light passes through materials whose atoms absorb the energy and immediately ___________ it as light.
Definition
re-emit
Term
Light waves are ____________, so they can be polarized (with vibrations all in the same direction).
Definition
transverse
Term
The aligning of vibrations in a transverse wave, usually by filtering out waves of other directions is called _________________.
Definition
polarization
Term
In 1905 Einstein published a theory explaining how light consists of particles that were massless bundles of concentrated electromagnetic energy. This was called the __________________________.
Definition
photoelectric effect
Term
The particle that travels only at the speed of light and whose energy is related to the frequency of the radiation in the wave model is called a__________.
Definition
photon
Term
Define: light-year.
Definition
The distance light travels in one year.
Term
A wave that is partly electric and partly magnetic and carries energy is called an _________________________.
Definition
electromagnetic wave
Term
Light is energy that travels in a wave that is partly ____________ and partly ___________________.
Definition
electric
magnetic
Term
The range of electromagnetic waves extending from radio waves to gamma rays is called _________________.
Definition
electromagnetic spectrum
Term
Electromagnetic waves of frequencies ____________ than visible red are called infrared.
Definition
lower
Term
Electromagnetic waves of frequencies _____________ than those of violet are called ultraviolet.
Definition
higher
Term
Radio waves are low-frequency ___________ waves?
Definition
light
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