Which has the highest index of refraction?
a. red
b. green
c. yellow
d. violet
e. indigo
d
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Standing Sound Waves: Consider a pipe of length L that is open at one end and closed at the other end. What are the wavelengths of the three lowest-pitch tones produced by this pipe?
A. 4L, 2L, L B. 2L, L, L/2 C. 2L, L, 2 L/3 D. 4L, 4L/3, 4L/5
The center of a long uniform log is raised to shoulder level while the other end is on the ground. If instead, the end of the log is raised to shoulder level, the work required is
A) half. B) the same. C) twice.
Calculations show that gravity begins to overcome thermal pressure in clouds that are
A) less massive than the Sun. B) more massive than the Sun. C) more massive than ten times the Sun. D) more massive than a hundred times the Sun. E) more massive than a thousand times the Sun.
A skydiver of 75-kg mass has a terminal velocity of 60 m/s. At what speed is the resistive force on the skydiver half that when at terminal speed?
A. 15 m/s B. 49 m/s C. 30 m/s D. 42 m/s E. 36 m/s