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
D
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If cooking is done using an aluminum pan over an electric burner, which of the following will not promote the rate of heat flow from burner to food?
a. increase pan bottom thickness c. increase burner temperature b. increase pan bottom area d. decrease height of pan sides
Two large, flat, horizontally oriented plates are parallel to each other, a distance d apart. Half way between the two plates the electric field has magnitude E
If the separation of the plates is reduced to d/2 what is the magnitude of the electric field half way between the plates? A) 4E B) 2E C) E D) 0 E) E/2
A measurement of an electron's speed is 2.0 × 106 m/s and has an uncertainty of 10%. What is the minimum uncertainty in position?
A) 0.29 nm B) 0.58 nm C) 0.87 nm D) 1.2 nm E) 1.6 nm
Compared to the speed of a 400 Hz sound, the speed of a 200 Hz sound through air is
A. twice as great. B. the same. C. one half as great. D. none of these answers are correct