Which of the following is NOT true about dark matter?
A.) Evidence for dark matter has been building for many decades.
B.) Dark matter and dark energy are two aspects of the same phenomenon.
C.) Dark matter is inferred from unseen gravitational effects in galaxies.
D.) Dark matter is the dominant source of gravity in the Universe.
E.) All of the above are true.
Ans: B.) Dark matter and dark energy are two aspects of the same phenomenon.
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A proton cyclotron has a magnetic field of 0.20 T between its poles and a radius of 0.40 m. What is the maximum energy for the protons from this machine?
A. 
B. 
C. 
D. 
E. 
Neptune and Uranus have a bluish tint because:
A) at their distances, the Sun appears blue, the red absorbed by dust in the ecliptic. B) they are far away and distance makes objects appear bluish. C) their atmospheres contain methane, which absorbs red light. D) their atmospheres contain hydrogen and helium. E) ammonia ice reflects blue light better than any other color.
Why do blue stragglers show up in globular clusters?
What will be an ideal response?
What is the minimum thickness of a coating of magnesium fluoride (n = 1.38) applied to glass (n = 1.50) that gives a minimum reflection for 600 nm light?
A. 600 nm B. 300 nm C. 435 nm D. 109 nm E. 100 nm