# Shared Flashcard Set

## Details

Chapter 27: Light Questions
Chapter 27: Light Questions
26
Physics
01/07/2012

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
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
 electricmagnetic
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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