The Milky Way:
A) contains less than 50 billion stars.
B) stretches across for just around 30,000 light-years.
C) is known for being very unique.
D) is larger than most other galaxies.
D
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Components: A displacement vector is 34.0 m in length and is directed 60.0° east of north. Selecting from the choices in the table below, what are the components of this vector?
A. choice 1 B. choice 2 C. choice 3 D. choice 4 E. choice 5
Is so-called "empty" space really empty?
A) Yes, because conservation of energy forbids the spontaneous creation of matter or radiation. B) Yes, because nothing exists other than particles and empty space. C) No, because of random quantum fluctuations. D) No, because neutrinos are always present at every point in the universe. E) No, because all space is filled with a physical substance known as "ether."
The type of EM wave used in aircraft radar is
a. radio waves. b. microwaves. c. x-rays. d. gamma rays.
You see colors with a prism because of
a. interference. b. diffraction. c. specular reflection. d. dispersion. e. polarization.