Astronomers can determine the interiors of main sequence stars by _____
a. studying their atmospheres
b. creating stellar models
c. detailed observations of the Sun
d. using the Hertzsprung-Russell Stellar Model (HRSM)
e. satellite observations of the closest stars
b
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Which of the following is the most abundant element in the Universe?
A) Nitrogen B) Oxygen C) Carbon D) Hydrogen
It is difficult to see items sharply in dim light because what
A. We are seeing primarily with the rods
B. We are seeing primarily with the cones
C. Rods do not adapt to the dark
D. We are mostly seeing with the fovea
Intensity of Sound: At a distance of 15.0 m from a sound source, the intensity level is 60.0 dB. What is the intensity level (in decibels) at a point 2.00 m from the source if the source radiates equally in all directions?
A. 55.7 dB B. 57.5 dB C. 75.5 dB D. 77.5 dB
During a lunar eclipse the Moon's phase must be
A) 3rd quarter. B) 1st quarter. C) new. D) full.