It is impossible to tell the difference between the two types of supernovae
Indicate whether the statement is true or false
FALSE
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The boundary between two air masses is called a
a. division. b. border. c. front. d. storm.
In an n-type semiconductor, the conduction-band energy is 1.1 eV and the donor energy level is 1.0 eV. At temperatures approaching 0 K the Fermi energy is equal to:
(a) 1.1 eV (b) 1.0 eV (c) 1.05 eV (d) 0.55 eV
A sphere is made up of two layers: The first is lead (density 11340
and is of radius R. The second is tin, (7310
and is concentric with the first, from radius R to radius 2R. The sphere is placed in a pool of mercury (density 13600 
How much of the volume of the sphere is below the surface?
A. 68.5% B. 57.5% C. 57.0% D. 64.2%
C3H4 is an example of a(n)
a. aromatic. b. alkene. c. alkyne. d. alkane. e. cycloalkane