A CD is made with a plastic coating with index of refraction n and is used with a laser that produces a wavelength l in the plastic. Which of the following pit depths would produce the desired destructive interference in this situation?
a. l/2n
c. l/4n
b. l/4
d. l/2
B
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A string 40.0 cm long of mass 8.50 g is fixed at both ends and is under a tension of 425 N
When this string is vibrating in its third OVERTONE, you observe that it causes a nearby pipe, open at both ends, to resonate in its third HARMONIC. The speed of sound in the room is 344 m/s. (a) How long is the pipe? (b) What is the fundamental frequency of the pipe? What will be an ideal response?
You observe a spiral galaxy with a large central bulge and tightly wrapped arms. It would be classified a(n)
A) S0. B) E7. C) Sa. D) Sc. E) Sb.
An airplane overhead exceeds the sound barrier and produces a conical wave front. If the air through which the plane flew had been significantly warmer and the plane were traveling at the same speed, how would the angle of the conical wave front been different?
1.The angle would have been greater. 2.The angle would have been less. 3.The angle would have been the same. 4.The change in the angle cannot be determined from the information given.
When SI units are plugged into an equation, it is found that the units balance. Which of the following can we expect to be true for this equation?
a. The equation will be dimensionally correct. b. The equation will be dimensionally correct except sometimes in cases when the right-hand side of the equation has more than one term. c. The equation will not be dimensionally correct. d. All constants of proportionality will be correct.