Why are astronomers interested in building observatories capable of detecting neutrinos, cosmic rays, and gravitational waves?
A) These things are not forms of light, and therefore can provide different types of information than light about objects that emit them.
B) These things are the highest energy forms of light, even more energetic than gamma rays, and therefore can tell us about explosive processes in the universe.
C) These things should in principle be much easier to detect than light, which means we could build these observatories cheaply.
D) These things are emitted from the same objects that emit x-rays, but unlike x-rays they can be detected with observatories on the ground.
A) These things are not forms of light, and therefore can provide different types of information than light about objects that emit them.
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A CD is made with a plastic coating with index of refraction n and is used with a laser that produces a wavelength l in the plastic. Which of the following pit depths would produce the desired destructive interference in this situation?
a. l/2n c. l/4n b. l/4 d. l/2
Where is the highest point on the topographic map? Determine the average slope due north and due south of the highest point. Give your answer in feet per mile. Slope equals the change in elevation divided by the change in horizontal distance
Which of the statements below is part of both the Ptolemaic and Copernican models?
A) The Earth orbits the Sun once a year. B) The Sun lies in the center of the Cosmos. C) The Moon orbits the Earth once a month. D) Epicycles are needed to explain retrograde motion of the planets. E) Venus' epicycle must always lie between us and the Sun.
Exfoliation
What will be an ideal response?