Universal time, or UT, is
A) another name for standard time.
B) the mean solar time in Greenwich, England.
C) the apparent solar time in Greenwich, England.
D) a timekeeping system based on careful observations of positions of stars throughout the universe.
B
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The wave is observed in such experiments as the electron double-slit experiment is
A) a traveling disturbance in a large collection of electrons or other sub-atomic particles. B) due to oscillations of the various sub-atomic force fields such as the strong force field. C) a wave in an electromagnetic field. D) a wave in a matter field. E) due to the impact of sub-atomic particles, such as neutrinos, that randomly hit and deflect the moving electron.
In a blackbody, the energy of the oscillating atoms is quantized
a. True b. False Indicate whether the statement is true or false
Why might it be difficult for Earth-like planets to form around Sun-like stars in the outer parts of the disk of our galaxy?
A) there would be insufficient amounts of heavy elements B) the stars would be packed together too densely for planets to be stable C) any stars would be sucked into the central supermassive black hole D) there would be too much harmful radiation
The most likely method of interstellar communication is similar to which type of communication on Earth?
A) sign language B) telepathy C) Morse code D) the spoken word