To keep chickens in a chicken coop warm, the kind of lamp to use is
A) fluorescent.
B) CFL.
C) incandescent.
D) LED.
E) all about the same
Answer: C
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Pulsars cannot be spinning white dwarfs because
a. white dwarfs are not that common. b. white dwarfs are not dense enough. c. white dwarfs do not have magnetic fields. d. a white dwarf spinning that fast would fly apart. e. all of the above
You can hear sound through an open window from sources that are not in your line of sight because of __________
Fill in the blank(s) with correct word
What is the maximum possible angular magnification of the converging lens of focal length 5 cm for a person with normal vision?
A) 2 B) 3 C) 4 D) 6 E) 5
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 l = 0.093 4 nm are used, what is the smallest angle q at which a diffraction maximum may be obtained?
a. 9.92° b. 7.60° c. 13.3° d. 15.5° e. 6.52°