If you wear green sunglasses and look at equations written in white chalk on a chalkboard, you would see the chalk as
A) green.
B) white.
C) red.
D) black.
E) yellow.
A
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If the energy gap in a semiconductor is 1.0 eV, which of the following energy photons will have the lowest absorption coefficient in the semiconductor?
(a) 0.2 eV (b) 0.8 eV (c) 1.2 eV (d) 2 eV
Why is it easier to locate meteorites in Antarctica than anywhere else on Earth? a. Antarctica is an easy location for humans to access
b. More scientists are in the area to find meteorites. c. When meteorites land, they melt a small crater on the ice. d. Meteorites are easy to detect on top of the ice where there are no Earth rocks. e. Meteorites fall most often through the ozone hole above the South Pole.
A straight wire of length 70 cm carries a current of 50 A and makes an angle of 60° with a uniform magnetic field. If the force on the wire is 1.0 N what is the magnitude of 
?
A. 41 mT B. 33 mT C. 55 mT D. 87 mT E. 57 mT
A 320-g air track cart traveling at 1.25 m/s collides elastically with a stationary 270-g cart. What is the speed of the 320-g cart after the collision?
A) 0.678 m/s B) 0.106 m/s C) 0.212 m/s D) 1.36 m/s E) 1.14 m/s