Of the following lenses, which is not a converging lens?
A)
concave meniscus
B)
planoconcave
C)
double convex
D)
planoconvex
E)
All of the above are not converging lenses.
B
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Matter Waves: The spacing of the atoms of a crystal is 159 pm. A monoenergetic beam of neutrons directed normally at the surface of the crystal undergoes first order diffraction at an angle of 58° from the normal. What is the energy of each of the neutrons? (mneutron = 1.675 × 10-27 kg, 1 eV = 1.6 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 0.045 eV B. 0.039 eV C. 0.050 eV D. 0.056 eV E. 0.061 eV
Which of the following is true about Neptune?
a) Its atmospheric composition and rings are most like Saturn's. b) Its atmospheric composition is most like Saturn's, but its rings aremore like thoseof Uranus and Jupiter. c) Its atmospheric composition is most like Uranus and its rings are likethose of Uranusand Jupiter. d) Its atmospheric composition and its rings are most like Jupiter's. e) It is more like the Earth than it is like any of the other giant planets.
Star A and star B have the same temperature, but star A is 5 times bigger than star B. Which statement below is correct?
A) Star A is redder and dimmer than star B. B) Star A is bluer and dimmer than star B. C) Star A is redder and brighter than star B. D) Star A is bluer and brighter than star B. E) Star A and star B have the same color, but star A is brighter.
A lens of focal length 40 mm is used as a magnifier. The object being viewed is 5.3 mm long, and is positioned at the focal point of the lens. The user of the magnifier has a near point at 25 cm
The angular magnification of the magnifier is closest to: A) 6.3 B) 5.6 C) 6.9 D) 7.5 E) 8.1