A light beam has speed c in vacuum and speed v in a certain plastic. The index of refraction n of this plastic is
A) n = cv.
B) n = (v/c)2.
C) n = v/c.
D) n = c/v.
E) n = (c/v)2.
D
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Which of the following mechanisms can change the half-life of radioactive nuclei?
A. Extreme high pressure B. Increasing the number of nuclei in the sample C. Extreme high temperature D. None of these choices are correct
When a workman strikes a steel pipeline with a hammer, he generates both longitudinal and transverse waves. The two types of reflected waves return 2.4 s apart. How far away is the reflection point? (For steel, vL = 6.2 km/s, vT = 3.2 km/s)
The helium flash shows up on the H-R diagram on the way to the horizontal branch
Indicate whether the statement is true or false
Four identical 4-mF capacitors are connected together electrically. What is the least possible capacitance of the combination?
a. 4 mF c. 1/8 mF b. 1 mF d. 1/4 mF