Which of the following statements about brown dwarfs is not true?
A) Brown dwarfs are supported against gravity by degeneracy pressure, which does not depend on the object's temperature.
B) Brown dwarfs eventually collapse to become white dwarfs.
C) All brown dwarfs have masses less than about 8% that of our Sun.
D) Brown dwarfs form like ordinary stars but are too small to sustain nuclear fusion in their cores.
B
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When long-wavelength light is seen in the interference colors of a soap bubble, the wavelength being cancelled is relatively
A) long. B) short. C) neither of these
Which one of the following scientists first built and operated devices that could emit and detect human-made electromagnetic radiation?
a. Hertz b. Ampere c. Maxwell d. Lenz
Two electric charges QA = + 1.0 ?C and QB= - 2.0 ?C are located 0.50 m apart. How much work is needed to move the charges apart and double the distance between them?
A) -36 × 10-3J B) +18 × 10-3 C) 0 D) +36 × 10-3 E) -18 × 10-3
What drives the motion of the tectonic plates on Earth?
A) convection cells in the mantle B) lava flows in trenches along the sea floor C) the Coriolis force D) Earth's magnetic field E) tidal forces