Why do rich clusters of galaxies contain a larger fraction of ellipticals than poor clusters or groups of galaxies?
What will be an ideal response?
In the densest clusters, collisions happen frequently, tearing off the spiral arms and dissipating their material into the intergalactic medium at high temperatures.
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The large, dark mare on Ganymede were created by water that erupted from within the moon
Indicate whether the statement is true or false
Electrons are accelerated through a potential difference of 90.0 kV and directed at a tungsten target to produce x-rays. What is the cutoff frequency in the x-ray spectrum produced?
a. 
b. 
c. 
d. 
e. 
If an electromagnetic wave moves in the +y direction, and its magnetic field disturbance is in the +z direction, what polarization does this wave have? (Assume the z axis points upward.)
A. Upright polarization B. Horizontal polarization C. One cannot answer without more information.
Molecular Rotation: For a diatomic quantum mechanical rotator, the energy difference between adjacent energy levels
A. increases as L increases. B. decreases as L increases. C. is constant for all L. D. varies randomly as L increases.