A Plexiglas wall has reflectivity of 0.1. Estimate the transmissivity if its emissivity is 0.3.
What will be an ideal response?
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The density of interstellar dust is very low, yet it still blocks starlight because
A) there is 100 times more opaque gas than dust present in the interstellar medium. B) it is so cold it absorbs higher energy photons. C) the dust particles are about the same size as the light waves they absorb. D) the dust particles are irregular in shape. E) ice particles reflect all light back toward their stars, not toward us.
Consider the cosine of any angle between 35° and 40°. If the angle were doubled, what would happen to the cosine of the angle
a. It would halve. b. It would decrease to less than half its original value. c. It would decrease but be more than half its original value. d. In different cases, it could do any of the above.
Which of the Jovian planets has a giant circulating storm that called the Great Red Spot that has lasted for centuries?
a. Pluto b. Uranus c. Neptune d. Saturn e. Jupiter
What makes up the interstellar medium?
A) O and B stars B) open clusters C) K and M stars D) gas and dust E) all of the above