The wavelength of a ruby laser is 694.3 nm. What is the energy difference between the two energy states for the transition that produces this light? (c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A) 1.54 eV
B) 1.65 eV
C) 1.79 eV
D) 1.81 eV
C
Physics & Space Science
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Three particles are placed in the xy plane. A 30-g particle is located at (3, 4) m, and a 40-g particle is located at (?2, ?2) m. Where must a 20-g particle be placed so that the center of mass of the three-particle system is at the origin?
a. (?3, ?1) m b. (+1, +3) m c. (+3, ?1) m d. (?1, ?3) m e. (?0.5, ?2) m
Physics & Space Science
The main application of PEEK is as a(n) _________material for carbon-fiber-reinforced composites in aircraft.
Fill in the blank(s) with the appropriate word(s).
Physics & Space Science
Aristotle believed that natural laws could be understood by
A) experiment. B) logic. C) patterns. D) mathematics.
Physics & Space Science
Approximately when does a third-quarter moon rise?
A) sunset B) noon C) midnight D) sunrise
Physics & Space Science