Which of these is a likely source of strong gravity waves?
a. The Earth.
b. The Sun.
c. A supernova.
d. Nuclear fission.
e. Nuclear fusion in stars.
c
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When a beam of light that is traveling in glass strikes an air boundary at the surface of the glass, there is
A) a 90° phase change in the reflected beam. B) no phase change in the reflected beam. C) a 180° phase change in the reflected beam. D) a 60° phase change in the reflected beam. E) a 45° phase change in the reflected beam.
In a reflecting telescope, the objective is a mirror
Indicate whether the statement is true or false
Of the following substances, which one contains the highest density of free electrons?
a. glass c. iron b. hard rubber d. amber
Why does the Moon have a layer of powdery "soil" on its surface?
A) Large impacts shattered lunar rock to make this soil. B) The soil exists because the Moon accreted from powdery material after a giant impact blasted Earth. C) Volatiles escaping from the Moon's interior bubble upward and make the soil. D) The soil is the result of the same processes that make powdery sand on Earth. E) It's the result of gradual erosion by micrometeorites striking the Moon.