A ray of light traveling through water passes through an air bubble. Which path does it take?
A. A
B. B
C. C
D. D
E. E
Answer: A
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Three point charges, 
and
are located at the vertices of an equilateral triangle. If 
what value must q3 have so that the total potential energy of the arrangement is zero?
A. q1 B. 0.5 q1 C. -0.5 q1 D. (q1+ q2)/2 E. no value will have this result
When a jet plane exceeds the speed of sound, a(n) ______________ forms, resulting in a sonic boom
Fill in the blank(s) with correct word
A CD player uses a laser with wavelength 900 nm. If the CD has a plastic coating with index 1.50, what is the wavelength in the plastic?
a. 600 nm c. 1350 nm b. 500 nm d. 750 nm
At what distance from a long straight wire carrying a current of 5.0 A is the magnitude of the magnetic field due to the wire equal to the strength of the Earth's magnetic field of about 5.0 × 10-5 T?
A) 1.0 cm B) 2.0 cm C) 3.0 cm D) 4.0 cm E) 5.0 cm