The farthest galaxies visible in Hubble Space Telescope photos are about ________ light-years away.
A) 1 million
B) 12 million
C) 1 billion
D) 12 billion
E) 12 trillion
D) 12 billion
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The image area on 35 mm film is 24 mm x 36 mm. What focal length lens of the following will allow an image of the moon, 
in diameter, to just fit on the film?
A. 2.8 m B. 1.4 m C. 0.85 m D. 12 mm E. 55 mm
If the interplanar spacing of NaCl is 2.814 × 10^?10 m, what is the predicted angle at which X-rays of wavelength 0.140 nm will be diffracted in a first-order maximum?
a. 31.3° b. 7.20° c. 20.5° d. 14.4° e. 29.8°
What distance method is used to determine the distance to the most distant galaxies?
a. Radar echo b. Supernova observations c. Period-luminosity relationship of variable stars d. Parallax
Resistance and Resistivity: What is the resistance of 1.0 m of a solid cylindrical metal cable having a diameter of 0.40 inches and a resistivity of 1.68 × 10-8 ? ? m?
A. 0.00012 ? B. 0.00021 ? C. 0.0012 ? D. 0.0021 ?