What is not true of Population I stars?
A. They are found in the disk.
B. They are frequently blue.
C. They are old.
D. They are high heavy element content.
Answer: C
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The type of element is determined by the number of ____
a. protons in the atom b. neutrons in the atom c. electrons in the atom d. electrons that have been removed from the atom e. protons that have been removed from the atom
A runner in a race takes 2.7 seconds to go from the 40 meter mark to the 70 meter mark. (a) What is the runner's speed? (b) How far would the runner go in 8 seconds if this speed is maintained? (c) How long did it take the runner to cover the first 40 m (assuming the same speed was maintained)?
An electron in a cathode ray tube is accelerated through a potential difference of 10 kV. What kinetic energy does the electron gain in the process? (e = 1.6 × 10^-19 C)
a. 8.0 × 10^-16 J c. 8.0 × 10^22 J b. 1.6 × 10^-15 J d. 1.6 × 10^-16 J
Air moves from
A) a region of low pressure to a region of high pressure. B) a region of high pressure to a region of low pressure. C) a region of stability to a region of instability. D) a cold front to a warm front.