Negatively charged particles in an atom are called ________.
A. protons
B. neutrinos
C. electrons
D. positrons
E. neutrons
Answer: C
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Jupiter is slowly shrinking through gravitational contraction today
Indicate whether the statement is true or false
On a night when a human eye can see a fourth magnitude star, a 60mm telescope, with 100× the surface area as our pupil, would be able to just barely detect
A) ninth magnitude Barnard's Star. B) eighth magnitude Uranus. C) seventh magnitude Titan, Saturn's largest moon. D) eleventh magnitude Tethys, Saturn's second largest moon. E) thirteenth magnitude Pluto.
At every instant the ratio of the magnitude of the electric to the magnetic field in an electromagnetic wave in vacuum is equal to
a. the speed of radio waves. b. the speed of light. c. the speed of gamma rays. d. all of the above. e. only (a) and (b) above.
Refined the Earth-centered Solar System
A. Solar Eclipses |
B. Alpha Centauri |
C. Proxima Centauri |
D. Lunar Eclipses |
E. Nicolas Copernicus |
F. Claudius Ptolemy |