Rutherford's experiments involving the use of alpha particle beams directed onto thin metal foils demonstrated the existence of which of the following?
a. proton
c. nucleus
b. neutron
d. positron
C
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Applications to Astronomy: The earth's orbit has a mean radius of 1.5 × 108 km. Over a six-month period, the apparent position of a particular star varies by 0.00014° due to parallax. How many kilometers is this star from Earth?
A. 1.2 × 1011 km B. 1.2 × 1014 km C. 1.2 × 1017 km D. 1.2 × 1020 km
Polaris is always the polestar.
Answer the following statement true (T) or false (F)
Which of the following is a feature of our solar system that should be predicted by a successful theory of solar system formation?
A) the age of our solar system B) the fact that all the planets in our solar system orbit the Sun in the same direction C) the fact that there are exactly four terrestrial planets and exactly four jovian planets D) the fact that Earth has a 23-1/2° axis tilt E) the fact that Jupiter has the most known moons in the solar system
Light emitted by the Sun is
A) polarized. B) nonpolarized. C) sometimes polarized.