Which of the following telescopes must be used above Earth's atmosphere?
a. an optical telescope
b. the VLBI telescope
c. an x-ray telescope
d. a radio telescope
e. none of the above
C
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Which of the following makes an approximate uniform electric field?
A) a metal charged sphere B) a metal charged cylinder C) a very long line of positive charge D) very large, closely separated, parallel oppositely charged plates E) two long parallel, closely separated, oppositely charged lines of charge
In order for organic molecules to have formed on the early Earth, what do we know could not have been present in the atmosphere in significant quantities?
A) oxygen (O2) B) nitrogen (N2) C) carbon dioxide (CO2) D) argon (Ar)
Regions of compression that move at their own speed in the disk and are outlined by the spiral arms are _____________
Fill in the blank(s) with correct word
Microscopes are inherently limited by the wavelength of the light used. How much smaller (in order of magnitude) can we "see" using an electron microscope whose electrons have been accelerated through a potential difference of 50000 V than using red light (500 nm)?
a. 3 b. 4 c. 5 d. 6 e. 14