________ 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
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How does the diffraction pattern due to an opaque wire compare to the diffraction pattern due to a slit with the same width?
A. The slit creates wider pattern B. The slit creates a narrower pattern C. The slit and wire create the same pattern D. The wire does not create a diffraction pattern.
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
A. objects can only float in a fluid if their density is less than that of the fluid. B. what goes up must come down. C. objects heavier than air can only fly through the air with the help of a motor. D. the object comes down when the air in it eventually leaks out.
If the total energy of an electron in an accelerator is three times its rest energy, what is its speed? (c = 3.00 × 10^8 m/s)
a. 2.00 × 10^8 m/s b. 1.30 × 10^8 m/s c. 1.41 × 10^8 m/s d. 2.98 × 10^8 m/s e. 2.83 × 10^8 m/s
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?
A) 83° B) 19° C) 59° D) 27° E) 55°