________ galaxies contain mostly Population II stars; while ________ galaxies contain both Population I and Population II stars.

A. Elliptical; spiral
B. Spiral; elliptical
C. Irregular; elliptical
D. Irregular; spiral


Answer: A

Physics & Space Science

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A sealed hot air balloon is capable of rising to high altitudes when it is initially released. As the air in the balloon cools, however, it eventually comes back down to the ground because

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Light enters an equilateral triangle prism in a direction parallel to one side. The prism is made of glass with an index of refraction of 1.52. What is the angle between the incoming ray and the ray that leaves the prism on the other side?

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Physics & Space Science