A cold region of dust which scatters the light of nearby stars produces a nebula which appears ________ in color, such as the one encompassing the Pleiades cluster
Fill in the blank(s) with correct word
blue
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Which of the following stars is reddish in color?
A. F6 B. A0 C. K9 D. G5 E. B2
______________, lava, and pyroclastics are the three general products emitted during a volcanic eruption
Fill in the blank(s) with correct word
Two children, Ahmed and Jacques, ride on a merry-go-round. Ahmed is at a greater distance from the axis of rotation than Jacques. Which of the following are true statements? (There could be more than one correct choice.)
A) Jacques has a greater angular speed than Ahmed. B) Jacques and Ahmed have the same angular speed. C) Jacques has a smaller angular speed than Ahmed. D) Ahmed has a greater tangential speed than Jacques. E) Jacques and Ahmed have the same tangential speed.
When a hydrogen electron is in its first excited state, its principal quantum number is
a. zero. b. 2. c. –13.60 eV. d. 1.