Certain planes of a crystal of halite have a spacing of 0.399 nm. The crystal is irradiated by a beam of x-rays. First order constructive interference occurs when the beam makes an angle of 20° with the planes
What is the wavelength of the x-rays? A) 0.14 nm
B) 0.17 nm
C) 0.21 nm
D) 0.24 nm
E) 0.27 nm
E
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Stellar cores, near the end of a star’s lifetime, produce iron by fusion. The reason stellar cores don’t go past iron is that
A. iron in stellar cores tends to spontaneously fission. B. Iron is the most dense material in solid form C. iron nuclei are the most tightly bound per nucleon. D. iron is ferromagnetic. E. iron is heavy.
A 650-N tightrope walker stands at the center of the rope such that each half of the rope makes an angle of 10.0° with the horizontal. What is the tension in the rope?
a. 1 870 N b. 660 N c. 3 740 N d. 226 N e. 1 840 N
What eventually halts the gravitational collapse of an interstellar gas cloud that forms an object that is massive enough to become a star?
A) the central object becoming hot enough to sustain nuclear fusion in its core B) a critical fraction of the gas has been driven further into space C) nothing; all collapsing gas clouds become black holes D) the crowding of electrons in the core
Elementary Particles: The neutron is made up of which one of the following quark combinations (up, down, strange, charm, top, bottom)?
A. uud B. ddu C. udd D. ttb E. bst