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Unit 1

Vocabulary

TermDefinition
wavelength the distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave
frequency the number of crests of a wave that move past a given point in a given unit of time
energy the ability to do work. Energy comes in different forms: Heat (thermal) Light (radiant) Motion (kinetic)
black hole a region of space time exhibiting gravitational acceleration so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it
supernova a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass
sunspots temporary phenomena on the Sun's photosphere that appear as spots darker than the surrounding areas. They are regions of reduced surface temperature
elements the building blocks for all the rest of the matter in the world
solar flare sudden flash of increased brightness on the Sun, usually observed near its surface
big bang theory leading explanation about how the universe began. It says the universe as we know it started with a small singularity, then inflated over the next 13.8 billion years to the cosmos that we know today
red shift the displacement of spectral lines toward longer wavelengths
crest the maximum or highest point in a cycle of waves
trough the minimum or lowest point in a cycle of waves
fusion the process or result of joining two or more things together to form a single entity
electromagnetic spectrum the range of wavelengths or frequencies over which electromagnetic energy extends.
spectra a band of colors, as seen in a rainbow, produced by separation of the components of light by their different degrees of refraction according to wavelength
parallax the effect whereby the position or direction of an object appears to differ when viewed from different positions, e.g. through the viewfinder and the lens of a camera
hertz the SI unit of frequency, equal to one cycle per second
Created by: afielder
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