What was it that the Compton effect illustrated?
What will be an ideal response?
Electromagnetic waves (X-rays) could act as particles (photons) when scattering off electrons.
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Star A has an apparent magnitude = 3 and star B has an apparent magnitude = 5. Which star is brighter in our sky?
A) Star A B) Star B C) There is not enough information to answer the question. D) The two stars have the same brightness in our sky, but Star A is closer to us than Star B.
What is meant by the "habitable zone"?
A) the zone where water can be a liquid around the center of the Galaxy B) the region around each star where terrestrial planets could have liquid water on their surfaces C) the zone in which terrestrial-sized planets could form around each star D) the region in dense atmospheres like Jupiter's that water droplets could form E) the regions near the poles of Mercury where liquid water might exist
Galileo used a telescope to observe the phases of the Sun
a. True b. False Indicate whether the statement is true or false
The nearest lobe radio galaxy to our Milky Way is
A) M42 in Orion. B) M87 in Virgo. C) the Whirlpool, M51. D) M13 in Hercules. E) Centaurus A.