Comets are rich in ________.
A. carbon dioxide (CO2)
B. water
C. carbon monoxide (CO)
D. All of these choices are correct.
Answer: D
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Ionization of hydrogen in H II regions is most visible at:
A) 12,367 nm, the Paschen alpha line. B) 656.3 nm, Balmer alpha line for 3-2 electron transition. C) 21 cm in the radio region for the spin-flip of its electron. D) 121.3 nm, the Lyman alpha ultraviolet line for 2-1 electron transition. E) 473.2 nm, the blue-green emission line for 4-2 electron transition.
Which of the following terms describe lenses that are thicker at the center than at the edges? (There could be more than one correct choice.)
A) converging lenses B) diverging lenses C) concave lenses D) convex lenses
Bluer stars are brighter than redder stars of the same size. Assume both are typical stars
a. True b. False Indicate whether the statement is true or false
The speed of light changes when it goes from ethyl alcohol (n = 1.36) to carbon tetrachloride (n = 1.46). The ratio of the speed in carbon tetrachloride to the speed in ethyl alcohol, v2/v1, is
a. 1.99 b. 1.07 c. 0.932 d. 0.511 e. 0.760