In a smoke detector, current flows between the plates because the radiation ___________ the air
Fill in the blank(s) with correct word
ionizes
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Which of the following statements about the Milky Way Galaxy is not true?
A) One rotation of the galaxy takes about 200 million years. B) Our solar system is located very close to the center of the Milky Way Galaxy. C) The galaxy is about 100,000 light-years in diameter. D) It contains between 100 billion and 1 trillion stars.
A star in the instability strip of the H-R diagram would
A) explode as a Type I supernova. B) vary in both temperature and radius. C) vary in temperature and radius, but not in brightness. D) vary in brightness with an irregular pattern. E) vary in temperature and brightness, but not in radius.
Exhibit 4-2
Newton approximated motion in a circle as a series of linear motions, as in the polygon below.
Assume that the particle moves at constant speed vA from A to B, and at constant speed vB from B to C.
Use this exhibit to answer the following question(s).
Refer to Exhibit 4-2. The direction of the acceleration,
, at point B, is shown by the arrow ina.
Physics & Space Science
Which of the following statements about nuclear fusion is not true?
A. It involves two or more small atomic nuclei slamming into each other and sticking together to make a larger atomic nucleus. B. It refers solely to the process of converting hydrogen into helium. C. It is the process that has made most of the elements of which we and the Earth are made. D. It is the process that generates the energy by which our Sun shines.