Chapter #6 Flashcards
There are no X-ray telescopes on Earth because
x-rays don’t penetrate Earth’s atmosphere
There are no radio telescopes in space because
radio waves penetrate Earth’s atmosphere so there is no need to put one in space
The radiation our eyes are most sensitive to lies in the color
yellow-green at about 550 nm.
Which type of radiation can be observed well from Earth’s surface?
visible
What is the primary purpose of an astronomical telescope?
to collect a lot of light and bring it to a focus
Why are most large telescopes reflectors, not refractors?
All of the above are correct
Which design has a convex primary mirror and flat secondary mirror, with the eyepiece located on the top side of the telescope tube?
newtonian relfector
The convex secondary mirror in this design focuses light down through a hole cut in the concave primary mirror.
cassegrain reflector
The amount of diffraction, and thus the resolution of the scope, depends upon:
the wavelength used and the size of the main telescope objects lens or mirror
The angular resolution of an 8-inch diameter telescope is ____ greater than of a 2-inch diameter telescope.
4 times
It is diffraction that limits the ___ of a telescope’s objective
resolution
What type of telescope is the Subaru?
cassegrain reflector
What is the resolving of the telescope?
the ability to distinguish adjacent objects in the sky
The process occuring when photons bounce off a polished surface is called
reflection
Compared to a 5-inch prime focus reflector, a 5-inch Newtonian reflector will
have the same light gathering power
