____________________ can be used to determine the distance to a star when the spectrum of the star can be used to determine its spectral type and luminosity class
Fill in the blank(s) with correct word
Spectroscopic parallax
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The orbits of many extrasolar planets detected to date are
A) parabolic B) highly elliptical C) perfectly circular D) slightly elliptical
At the microscopic level, electric currents in wires are due to
A) electromagnetic radiation. B) the great pumpkin. C) protons [and possibly other ions] traveling along the wire. D) atoms jiggling back and forth within the wire. E) electrons traveling along the wire.
A girl is standing in front of a concave mirror. Consider two rays of light, one from her nose and one from her mouth that are parallel as they are traveling toward the mirror. These rays will come together
a. at the focal point. b. at the center of curvature. c. at the image point. d. behind the mirror if she is too close to the mirror.
If the Moon were four times as massive but twice as far from Earth, high tides on Earth would be
A) higher. B) lower. C) no different.