The relative density of dust to gas is least in which place?
A) the interstellar medium
B) dark nebulae
C) the atmosphere of Earth
D) molecular clouds
E) reflection nebulae
C
You might also like to view...
This figure shows an all-sky map of the cosmic microwave background recorded by the Planck telescope. How long did this light travel through space before it reached the telescope?
A) about 14 billion years B) about 380,000 years C) about a million years D) Depending on what portion of the map we're looking at, the light traveled for times between just a few minutes and a few billion years.
A sound with a frequency of 15 Hz is in the ______________ region of the sound spectrum
Fill in the blank(s) with correct word
A heat engine produces 300 W of mechanical power while discarding 1200 W into the environment (its cold reservoir). What is this engine’s efficiency?
A. 0.20 B. 0.25 C. 0.33 D. Other (specify)
A golf ball hits a wall and bounces back at 3/4 the original speed. What part of the original kinetic energy of the ball did it lose in the collision?
a. 1/4 c. 7/16 b. 3/8 d. 9/16