Which of the following best describes the axes of a Hertzsprung-Russell (H-R) diagram?
A) mass on the horizontal axis and luminosity on the vertical axis
B) surface temperature on the horizontal axis and luminosity on the vertical axis
C) mass on the horizontal axis and stellar age on the vertical axis
D) interior temperature on the horizontal axis and mass on the vertical axis
E) surface temperature on the horizontal axis and radius on the vertical axis
B
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Temperature Scales: Which two temperature changes are equivalent?
A. 1 K = 1 F° B. 1 F° = 1 C° C. 1 C° = 1 K D. None of these
An ideal spring with a spring constant (force constant) of is stretched from equilibrium to 2.9 m. How much work is done in the process?
A) 93 J B) 186 J C) 47 J D) 121 J
What is the solar wind?
a. strong radiation that comes from the Sun b. similar to winds on Earth, but faster and stronger c. similar to winds on Earth, but less dense and weaker d. atoms and particles ejected from the Sun at high speed e. strong winds on the surface on the sun due to large temperature differences
A ___________ has a few million light-sensitive diodes in an array typically about a half-inch square
a. photometer b. charge-coupled device c. spectrograph d. photographic plate e. grating