A Type II supernova can form a(n) ______________ or a black hole
Fill in the blank(s) with correct word
neutron star
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If the interplanar spacing of NaCl is 2.814 × 10^?10 m, what is the predicted angle at which X-rays of wavelength 0.140 nm will be diffracted in a first-order maximum?
a. 31.3° b. 7.20° c. 20.5° d. 14.4° e. 29.8°
Bohr's model explains the absorption spectrum as the result of:
a. the specific jumps downward in energy that an electron has available in an unexcited atom. b. the specific jumps downward in energy that an electron has available in an unexcited atom. c. the specific jumps upward in energy that an electron has available in an unexcited atom. d. the specific jumps upward in energy that an electron has available in an excited atom. e. how an electron sometimes absorbs a photon when dropping to a lower level instead of emitting one.
Which one of the following is not one of the four major features of the solar system?
A. Large bodies in the solar system have orderly motions. B. Planets fall into two major categories (terrestrial and jovian). C. Several exceptions to the general trends stand out. D. Swarms of asteroids and comets populate the solar system. E. The solar system contains eight planets plus dwarf planets (such as Ceres, Pluto, and Eris).
A vehicle undergoes acceleration when it
A) gains speed. B) loses speed. C) changes its direction. D) all of the above