Dark nebula appear dark because they
A) reflect light.
B) emit light.
C) are opaque.
D) are transparent.
Answer: C
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Which of the following provides evidence for active volcanism on Venus today and in the past?
A) the direct observation of erupting volcanoes from orbit B) the presence of sulfuric acid clouds in the atmosphere C) the detection from orbit of elevated levels of infrared radiation from volcanic features on the surface D) Both B and C
Since radiation interacts with matter in individual particle-like impacts called photons, why does light seem continuous to us?
A) Each photon is spread out over a large region of space and these regions overlap each other. B) Because there are so many photons in a light beam and each carries such a small amount of energy. C) Each photon has a very wide range of energies, and these energy ranges overlap each other. D) Because of the way that the photons interact with each other. E) Because there are so few photons in a light beam and because they each carry such a large amount of energy.
A bridge that was 8.3 m long has been washed out by the rain several days ago. How fast must a car be going to successfully jump the stream? Although the road is level on both sides of the bridge, the road on the far side is 2.0 m lower than the road on this side
a. 5.0 m/s c. 13 m/s b. 7.8 m/s d. 25 m/s
Of all visible objects in the celestial sphere, which appears to move the least? Why?
What will be an ideal response?