Potassium Iodide (chemical formula: KI) has a face-centered cubic structure (just like sodium chloride). If the distance between crystal planes is d = 0.353 nm and X-rays of wavelength ? = 0.0934 nm are used, what is the smallest angle ? at which a diffraction maximum may be obtained?
a. 9.92°
b. 7.60°
c. 13.3°
d. 15.5°
e. 6.52°
b
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Fill in the blank(s) with the appropriate word(s).
The following four forces act on a 4.00 kg object:
F1 = 300 N east F2 = 700 N north F3 = 500 N west F4 = 600 N south What is the acceleration of the object? A) 224 N in a direction 63.4° north of west B) 300 N in a direction 63.4° north of west C) 300 N in a direction 26.6° north of west D) 224 N in a direction 26.6° north of west E) 2100 N in a direction 26.6° north of west
Which of the following most likely explains why Venus does not have a global magnetic field like Earth?
A) Its rotation is too slow. B) It does not have a metallic core. C) Unlike Earth, Venus does not have a liquid outer core. D) It has too thick of an atmosphere.
At the time of a full moon, an astronaut on the Moon looking at Earth would see a
a. full Earth moon. b. first-quarter Earth moon. c. last-quarter Earth moon. d. new Earth moon.