A two-slit apparatus is covered with a red (660 nm) filter. When white light is shone on the filter, on the screen beyond the two-slit apparatus, there are 9 interference minima within the 4.5 cm-wide central diffraction maximum. When a blue (440 nm) filter replaces the red, how many fringes will there be in the central diffraction maximum?
A. 3
B. 13
C. 9
D. 6
C. 9
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The refraction of light in a diamond is greater for
A) long-wavelength light. B) short-wavelength light. C) both refract the same
A solid sphere and a solid cylinder of the same mass and radius roll without slipping at the same speed. It is correct to say that the total kinetic energy of the solid sphere is
A) more than the total kinetic energy of the cylinder. B) less than the total kinetic energy of the cylinder. C) equal to the total kinetic energy of the cylinder. D) impossible to compare to the total kinetic energy of the cylinder.
A brass bar (E 5 110 MPa) of length L 5 2.5 m has diameter d1 5 18 mm over one-half of its length and diameter d2 5 12 mm over the other half. Compare this nonprismatic bar to a prismatic bar of the same volume of material with constant diameter d and length L. The elon-gation of the prismatic bar under the same load P 5 25 kN is approxi-mately:
(A) 3 mm
(B) 4 mm
(C) 5 mm
(D) 6 mm
Two electric charges each equal to +Q, are separated by a distance d. If you make a graph of the electric potential as a function of the distance along the line connecting the two charges, the point exactly midway between the two charges would
A) be a relative maximum. B) be a relative minimum. C) be neither a relative maximum nor a relative minimum. D) oscillate between being a relative maximum and a relative minimum.