Unit 2 Flashcards
An electromagnetic wave consists of a(n) _____ wave moving together, while being oriented 90° to each other.
Electrical and magnetic
_____ means to issue forth from a center.
Radiate
The _____ can collect light from very dim objects over many hours.
CCD and Camera
Any heated object emits _____ radiation.
Infrared
Electromagnetic waves only differ from one another in _____.
wavelength
One major goal of ____ astronomy is to match detected radio wave with the conditions and processes that produce them.
Radio
The front lens of a reflecting telescope is the _____ lens.
objective
Who invented the compound or achromatic lens?
Chester Hall
Who brought forth the electromagnetic theory of light?
James Maxwell
_____ is the change in direction from one medium to another of different density.
Refraction
A(n) ________ receives, amplifies, and preserves radio signals.
radio telescope
The function of the _____ in a refracting telescope is to gather more light than is possible for the human eye.
objective lens
_____ means pertaining to color.
Chromatic
_____ is the change in light waves passing near the edges of a gap.
Diffraction
Gamma rays are formed in stars’ cores as a result of _____.
fusion
The modern preferred means of producing a visible spectrum is a _____. _____ occurs when all light rays cannot be brought to a single focus.
diffraction grating, Aberration.
A special curve looking like the inside of a bowl is said to be _____.
parabolic
____ is the distance between two equal parts on consecutive wave forms.
wavelength
A photon is a unit of _____ energy.
radiant
Who created the reflecting telescope because he believed chromatic aberration in refractors would never be overcome?
Isaac Newton
In _____, an information processor delays signals from distant receivers so all signals arrive together.
Interferometry
CCD stands for _____.
Charge- Coupled device
Who proposed the multiple telescope?
Edward Synge
All _____ carries clues to what sort of event produced it.
electromagnetic radiation
The rear lens of a refracting telescope is the _____.
eyepiece
Who discovered two of Saturn’s moons?
William Herschel
A(n) _____ is an intervening substance through which an effect may be transported.
medium
_____ is both a particle and a wave.
photon
