The nearest comparable galaxy to our own lies in the constellation of
A) Orion. B) Andromeda. C) Sagittarius. D) Cygnus. E) Virgo.
B
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Compared to spiral galaxies, elliptical galaxies have
A. ...more gas, more dust, and less new star formation. B. ...less gas, more dust, and more new star formation. C. ...less gas, less dust, and more new star formation. D. ...more gas, more dust, and more new star formation. E. ...less gas, less dust, and less new star formation.
The image of our galaxy in radio emission from carbon monoxide maps the distribution of molecular clouds. Which of the following would give a similar picture of our galaxy?
A) visible light, which is closest to how the night sky appears from Earth B) 21-cm-line radio emission from atomic hydrogen C) X-rays from hot gas bubbles in the disk D) infrared emission from interstellar dust grains E) visible light, showing the edges of supernova bubbles
Light of wavelength 687 nm is incident on a single slit 0.75 mm wide
At what distance from the slit should a screen be placed if the second dark fringe in the diffraction pattern is to be 1.7 mm from the center of the diffraction pattern? A) 0.39 m B) 1.9 m C) 1.1 m D) 0.93 m E) 0.47 m
For general projectile motion, which statement is true when the projectile is at the highest point of its trajectory?
A) Its acceleration is zero. B) Its velocity is perpendicular to the acceleration. C) Its velocity and acceleration are both zero. D) The horizontal component of its velocity is zero. E) The horizontal and vertical components of its velocity are zero.