For hydrogen, the transition from the first to third excited state produces
A) an infrared line.
B) an ultraviolet line.
C) a red emission line.
D) a blue green absorption line.
E) a violet emission line.
D
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The average kinetic energy of a nitrogen molecule at room temperature (20°C) is
a. 2 × 10^-21 J. b. 4 × 10^-21 J. c. 6 × 10^-21 J. d. 8 × 10^-21 J. e. 1 × 10^-20 J.
In an H-R Diagram, stars with the smallest radius are found in the ____ of the diagram
a. center b. upper left corner c. upper right corner d. lower left corner e. lower right corner
At a certain instant in time, the field of an electromagnetic wave in a vacuum points in the -z direction, and the field points in the +y direction. In what direction is this wave traveling?
A) +x direction B) -x direction C) +y direction D) -z direction E) +z direction
A mass suspended from a spring bobs up and down one complete cycle every 2 s. Its period is
A) 0.5 s. B) 1 s. C) 2 s. D) none of the above