Consider an atom with four accessible energy levels. What is the maximum number of different wavelengths that could be emitted by such an atom?
A) 7
B) 4
C) 6
D) 5
E) 8
C
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The radiation detected by Penzias and Wilson is sometime referred to as CMBR, which stands for _______________ radiation
Fill in the blank(s) with correct word
Addition by 1. Components: Find the magnitude and direction of the resultant of the three force vectors, 
,
, and 
, shown in the figure. These vectors have the following magnitudes: A = 5.0 lb, B = 7.9 lb, and C = 8.0 lb. Express the direction of the resultant by specifying the angle it makes with the +x-axis, with counterclockwise angles taken to be positive.
style="vertical-align: 0.0px;" height="307" width="314" /> Fill in the blank(s) with the appropriate word(s).
A car traveling at 4.0 m/s has a constant acceleration of 2.0 
After 3.0 seconds, the distance traveled during the acceleration is
A. 21 m. B. 17 m. C. 10 m. D. 13 m. E. 9 m.
Mineral sample #1 is ____________.
Calcite - CaCO3 Dolomite - CaMg(CO3)2 Fluorite - CaF2