Of the following substances, which one contains the highest density of free electrons?
a. hard rubber
b. iron
c. amber
d. glass
b
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A double-convex lens made of glass having a refractive index of 1.50 has a radius of magnitude 40 cm on the front side and one of magnitude 30 cm on the back side. What is the focal length of this lens?
A) 34 cm B) -240 cm C) 80 cm D) 11 cm E) -11 cm
Two flat glass plates are in contact along one end and are separated by a sheet of paper 3.3 × 10^?6 m thick at the other end. The top plate is illuminated by a monochromatic light source of wavelength 514 nm. How many dark parallel bands will be evident across the top plate? (1 nm = 10?9 m)
a. 7 b. 11 c. 6 d. 13 e. 9
As air temperature cools below its dew point temperature, the air's water vapor
A) increases. B) decreases. C) condenses. D) evaporates.
A straight wire carries a current of 40 A in a uniform magnetic field (magnitude = 80 mT). If the force per unit length on this wire is 2.0 N/m, determine the angle between the wire and the magnetic field
a. either 39° or 141° b. either 25° or 155° c. either 70° or 110° d. either 42° or 138° e. either 65° or 115°