Kinetic Energy: An object hits a wall and bounces back with half of its original speed. What is the ratio of the final kinetic energy to the initial kinetic energy of the object?
A. 1/2
B. 1/4
C. 1/8
D. 1/16
Answer: B
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a. experiment. b. measurement. c. explanation. d. number.
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A sodium light, having wavelength 589.3 nm, is used to view a soap film to make it look black when directed perpendicular to the film. What is the minimum thickness of the soap film if the index of refraction of soap solution is 1.38?
A) 294 nm B) 194 nm C) 314 nm D) 114 nm E) 214 nm