In the color wheel shown below, which colors are the warm colors?
A. red, yellow, blue
B. orange, green, purple
C. green, blue, purple
D. yellow, orange, red
Answer: D
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Which of the following stars is a luminous red supergiant and is classified M2 Ia?
A) Spica B) Betelgeuse C) Pollux D) Miaplacidus
In a laboratory experiment, you are given two unknown substances and a laser. One of the substances is a liquid in which you place the laser. The other is a tank made of a transparent solid. You aim the laser downward at the tank bottom – and find that the reflected ray is fully polarized when the angle of incidence is 54o. What is the transmitted angle for the ray transmitted into the tank bottom?
A. 
B. 
C. can’t answer this without knowing the indices of refraction.
D. 
As stars evolve, their temperature and luminosity change; therefore, their spectral type (OBAF, etc.) changes as well.
Answer the following statement true (T) or false (F)
A string with a fixed frequency vibrator at one end is subjected to varying tensions. When the tension is 20 N, a resonance with 3 antinodes results. What tension would cause a resonance with 2 antinodes in this string?
A. 30 N B. 45 N C. 80 N D. 8.9 N E. 13 N