The property of cleavage reflects:
-the luster of the mineral.
-the hardness of the mineral.
-the streak of the mineral.
-mechanical breakage along planes of
weakness within the mineral.
-the density of the mineral.
-mechanical breakage along planes of
weakness within the mineral.
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Plane polarized light of intensity 
is passed through a polarizer oriented at 45 
to the original plane of polarization. What is the intensity transmitted?
A. 0.70 
B. 0.50
C. 0.35 
D. 0.25 
E. 0.00
Which would have the higher activation energy for diffusion, carbon in iron or nickel in iron? The atomic radius of carbon is 0.077 nm, the atomic radius of nickel is 0.124 nm, and the atomic radius of iron is 0.124 nm. _____________
Fill in the blank(s) with the appropriate word(s).
A coil of wire is connected to a galvanometer. When the coil is rotated in a magnetic field, the galvanometer records a current. The current results because of __________
Fill in the blank(s) with correct word
One of the absorption lines of hydrogen has a rest wavelength of 656 nm. Suppose you observe this line in four different stars, and find this line at the wavelengths show below. Which wavelength represents the star that is moving toward Earth the fastest?
A) 630 nm B) 656 nm C) 670 nm D) 640 nm