A series LR circuit includes a 9.0 V battery, a resistance of 0.50 
and an inductance of 0.80 H. What is the energy stored by the inductor 2.0 s after the switch is closed?
A. 33 mJ
B. 30 mJ
C. 13 J
D. 66 J
E. 33 J
D. 66 J
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Reactance: Consider a capacitor connected across the ac source. As the capacitance is increased, the current through the capacitor will
A. increase. B. remain constant. C. decrease.
_________is the increase in conductivity that results when photons excite electrons in a semiconductor or insulator into the conduction band.
Fill in the blank(s) with the appropriate word(s).
A sound source emits 20.0 W of acoustical power spread equally in all directions. The threshold of hearing is 1.0 × 10-12 W/m2. What is the sound intensity level 30.0 m from the source?
A) 92.5 dB B) 81.5 dB C) 1.77 × 10-3 dB D) 1.77 × 10-3 W E) -27.5 dB
Plane Mirrors: The image formed in a plane mirror is
A. at the same distance in front of the mirror as the object is in front of the mirror. B. a real image behind the mirror. C. at the same distance behind the mirror as the object is in front of the mirror. D. at a shorter distance behind the mirror than the distance the object is in front of the mirror. E. at a larger distance behind the mirror than the distance the object is in front of the mirror.