When you remove electrons from a metal cup, the cup becomes
A) negatively charged.
B) positively charged.
C) ionized.
Answer: B
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The wavelength of a periodic wave is 0.500 m. If the frequency is 400 Hz, then what is the magnitude of the k vector of the wave?
A. 12.6 
B. 14.8
C. 18.4
D. 21.0
E. 25.9
Molecules are found only in the ________ clouds of the interstellar medium
Fill in the blank(s) with correct word
What do we call the bright, sphere-shaped region of stars that occupies the central few thousand light-years of the Milky Way Galaxy?
A) the galaxy's disk B) the galaxy's bulge C) a globular cluster D) the galaxy's halo
Which of the following materials is most appropriate for a design of the magnetoresistance random access memory for a computer?
(a) Layers of Fe and Ni (b) Layers of Fe and Cr (c) Layers of Fe3O4 and MnO (d) Fe-3 wt. % Si