In the above H-R diagram, which main sequence star is biggest in size?
A. A
B. B
C. C
D. D
E. E
Answer: A
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In order to calculate the size and luminosity of a galaxy, you must first determine its ____
a. age b. mass c. shape d. metallicity e. distance
When a metal ring with a gap in the shape of the letter C is heated, the gap becomes
A) wider. B) narrower. C) remains the same size.
If a convex lens were made out of very thin clear plastic filled with air, and were then placed underwater where n = 1.33 and where the lens would have an effective index of refraction n = 1, the lens would act in the same way
a. as a concave mirror in air. b. as a concave lens in air. c. as a convex lens in air. d. as a flat refracting surface between water and air as seen from the water side. e. as the glasses worn by a farsighted person.
A chamber that can be filled with different gases has placed in it a source of sound that in air produces a frequency of 200 Hz and a microphone to pick up the sound for frequency analysis. First the chamber is filled with helium (speed of sound 1000 m/s at room conditions), then the helium is replaced with oxygen (speed of sound 330 m/s at room conditions), and then finally the helium is
replaced with carbon dioxide (speed of sound 269 m/s at room conditions). In which gas is the highest frequency of sound found by the microphone during this experiment? a. helium b. oxygen c. carbon dioxide d. They all have the same frequency of sound.