Optical fibers work because of
a. interference
b. diffraction
c. total internal reflection
d. diffuse reflection
e. polarization
C
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T and b quarks are named
a. truth and beauty. b. up and down. c. top and bottom. d. Itchy and Scratchy. e. none of the above.
Film behind a double slit is exposed to light in the following way: First one slit is opened and light is allowed to go through that slit for time Dt. Then it is closed and the other slit is opened and light is allowed to go through that slit for the same time Dt. When the film is developed the pattern will be
a. one single slit pattern. b. two superimposed single slit patterns, their centers displaced from each other by the distance between the two slits. c. one double slit pattern. d. two double slit patterns, their centers displaced from each other by the distance between the two slits. e. random darkening of the film. (no pattern at all)
A circular loop (radius = 0.50 m) carries a current of 3.0 A and has unit normal vector of (
)/3. What is the x component of the torque on this loop when it is placed in a uniform magnetic field of (
)T?
A. 4.7 N ? m B. 3.1 N ? m C. 19 N ? m D. 9.4 N ? m E. 12 N ? m
A string of linear density 1.5 g/m is under a tension of 20 N. What should be its length if its fundamental resonance frequency is 220 Hz?
A) 0.26 m B) 0.96 m C) 1.1 m D) 1.2 m