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Flashcards - NES General Science: Waves, Optics & Sound

Flashcards - NES General Science: Waves, Optics & Sound
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reflection
Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated
color
Color or colour is the visual perceptual property corresponding in humans to the categories called red, blue, yellow, etc
pigments
A pigment is a material that changes the color of reflected or transmitted light as the result of wavelength-selective absorption
rarefaction
Rarefaction is the reduction of an item's density, the opposite of compression
transverse wave
A transverse wave is a moving wave that consists of oscillations occurring perpendicular to the direction of energy transfer
frequency
Frequency is the number of occurrences of a repeating event per unit time
photon
A photon is an elementary particle, the quantum of all forms of electromagnetic radiation including light
Doppler effect
The Doppler effect is the change in frequency or wavelength of a wave for an observer moving relative to its source
lens
A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction
retina
The retina is the third and inner coat of the eye which is a light-sensitive layer of tissue
compound
A chemical compound is an entity consisting of two or more atoms, at least two from different elements, which associate via chemical bonds
prism
PRISM is a clandestine surveillance program under which the United States National Security Agency collects internet communications from at least nine major US internet companies
wave cycle
In physics, a wave is an oscillation accompanied by a transfer of energy that travels through a medium
Sound waves
In physics, sound is a vibration that propagates as a typically audible mechanical wave of pressure and displacement, through a medium such as air or water
dispersion
In optics, dispersion is the phenomenon in which the phase velocity of a wave depends on its frequency
index of refraction
In optics, the refractive index or index of refraction n of a material is a dimensionless number that describes how light propagates through that medium
Diffraction
Diffraction refers to various phenomena which occur when a wave encounters an obstacle or a slit
Interference
In physics, interference is a phenomenon in which two waves superpose to form a resultant wave of greater, lower, or the same amplitude
photoelectric effect
The photoelectric effect or photoemission is the production of electrons or other free carriers when light is shone onto a material
wave-particle duality
Wave–particle duality is the concept that every elementary particle or quantic entity may be partly described in terms not only of particles, but also of waves
blue shift
A blueshift is any decrease in wavelength, with a corresponding increase in frequency, of an electromagnetic wave; the opposite effect is referred to as redshift
sonic boom
A sonic boom is the sound associated with the shock waves created by an object traveling through the air faster than the speed of sound
equatorial mount
An equatorial mount is a mount for instruments that compensate the rotation of earth by having one rotational axis parallel to the Earth's axis of rotation
base
A military base is a facility directly owned and operated by or for the military or one of its branches that shelters military equipment and personnel, and facilitates training and operations
eyepiece
An eyepiece, or ocular lens, is a type of lens that is attached to a variety of optical devices such as telescopes and microscopes
microscope
A microscope is an instrument used to see objects that are too small for the naked eye
angle of incidence
In geometric optics, the angle of incidence is the angle between a ray incident on a surface and the line perpendicular to the surface at the point of incidence, called the normal
speed
In everyday use and in kinematics, the speed of an object is the magnitude of its velocity ; it is thus a scalar quantity
cataract
A cataract is a clouding of the lens in the eye leading to a decrease in vision

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