Galileo proposed that the Sun is a rotating sphere after he ____
a. noted how the Sun rose in the east and set in the west
b. discovered the parallax of the Sun
c. timed a full rotation of the Sun's equator
d. observed sunspots move across the surface of the Sun
e. measured different spectral lines of emission on different days
d
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When rubbing two insulators together, the one that gets a positive charge has had
A. protons added. B. protons removed. C. electrons added. D. electrons removed. E. electrons added and protons removed.
Galactic cannibalism is the capture of the stars in a smaller galaxy by a larger galaxy during collision between the two.
Answer the following statement true (T) or false (F)
The slope of a distance vs. time graph is the __________
Fill in the blank(s) with correct word
If the momentum of an electron is 1.95 × 10-27 kg ? m/s,
what is its de Broglie wavelength? (h = 6.626 × 10-34 J ? s) A) 340 nm B) 210 nm C) 170 nm D) 420 nm E) 520 nm