Total Internal Reflection: Lucite has an index of refraction of 1.50. What is its critical angle if it is in air?
A. 1.16°
B. 15°
C. 41.8°
D. 65.2°
E. 87.4°
Answer: C
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What becomes of the heavy elements produced by fusion in low-mass stars?
A. When the star goes supernova, they are sucked into the neutron star or black hole. B. They are blasted outward in a violent explosion. C. At the end of the star's life, they are dredged up by convection and pushed outward by photons. D. They are forever trapped in the core of the star. E. Low-mass stars do not produce heavy elements.
Which of the following statements about halo stars is false?
A) Halo stars have random orbits about the Milky Way center. B) Halo stars are no longer being formed at the current epoch. C) All halo stars are less massive than our Sun. D) Halo stars are made entirely of hydrogen and helium with no heavy elements. E) Halo stars are some of the oldest known objects in the universe.
A specimen is made of 80 atom % iron and 20 atom % Ni. When sufficient FCC nickel is added to BCC iron, it is possible to produce FCC iron-nickel alloys, which are austenitic. The results of an x-ray diffractometer scan of this specimen with cobalt K? radiation that has a wavelength of 0.1790 nm results in peak intensities at the following angles: 26.1°, 30.56°, 45.99°, 57.49°, and 61.74°.
(a) Is this iron-nickel alloy BCC or FCC? (b) Determine the lattice parameter using the 26.1? peak.
A horizontal tube consists of a 7.0-cm diameter pipe that narrows to a 2.0-cm-diameter throat. In the pipe, the water pressure is twice atmospheric pressure and the water flows with a speed of 0.40 m/s
What is the pressure in the throat, assuming that the water behaves like an ideal fluid? The density of water is 1000 kg/m3, and atmospheric pressure is 1.01 × 105 Pa. A) 1.9 atm B) 0.12 atm C) 2.1 atm D) 2.0 atm