Spiral Density Waves Move Through a Medium That Is Also

question 186

Multiple Choice

Spiral density waves move through a medium that is also moving. The speed of the density waves

• A) is greater than the speed of the medium through which they pass.
• B) is the same as that of the medium through which they pass, thus forming a rigid spiral pattern.
• C) is less than that of the medium through which they pass.
• D) varies as the waves go around the galaxy, slowing down while passing through a spiral arm and speeding up in the regions in between.

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