Yellow paint always subtracts or absorbs
a. Red light
b. Blue light
c. Yellow light
d. Cyan light
Ans: b. Blue light
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Consider a uniform electric field of 50. N/C directed toward the East. If the voltage measured relative to ground at a given point in the field is 80. V, what is the voltage at a point 1.0 m directly East of the point?
A) 15. V B) 30. V C) 0.15 kV D) 30. kV E) impossible to calculate from the information given
A double-convex lens is formed from a piece of plastic with an index of refraction of 1.70. The radius of the front surface has magnitude 20 cm, and the radius of the back surface has magnitude 30 cm. What is the focal length of this lens?
A) 86 cm B) -86 cm C) 43 cm D) -17 cm E) 17 cm
Lenz's law arises because of the following basic principle:
A. Gauss's law B. the conservation of momentum C. Coulomb’s law D. the conservation of energy E. the conservation of charge
How much current must flow through a long straight wire for the magnetic field strength to be 1.0 mT at 1.0 cm from a wire? (?0 = 4? × 10-7 T ? m/A)
A) 9.2 A B) 50 mA C) 50 A D) 16 A E) 5.0 mA