In single-slit diffraction
A) the central maximum is about as wide as the other maxima.
B) the central maximum is much narrower than the other maxima.
C) the central maximum is about twice as wide as the other maxima.
D) the intensities of successive maxima are roughly the same, falling off only gradually as one goes away from the central maximum.
E) the slit width must be less than one wavelength for a diffraction pattern to be apparent.
C
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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.
If Star A is closer to us than Star B, then Star A's parallax angle is
A) smaller than that of Star B. B) larger than that of Star B. C) hotter than that of Star B. D) fewer parsecs than that of Star B.
A prismatic shaft (diameter d0 5 19 mm) is loaded by torque T1. A stepped shaft (diameters d1 5 20 mm and d2 5 25 mm with radius of fillets R 5 2 mm) is loaded by torque T2. The allowable shear stress in the material is 42 MPa. The ratio T1/T2 of the maximum permissible torques that can be applied to the shafts, considering stress concentration effects in the stepped shaft is:
(A) 0.9
(B) 1.2
(C) 1.4
(D) 2.1
Sounds with frequencies higher than the human ear can detect are in the ______________ range
Fill in the blank(s) with correct word