The largest effective telescope, created by radio interferometry, is the diameter of
A) Earth.
B) the state of New Mexico.
C) several football fields, in a natural depression in Puerto Rico.
D) tens of miles across, in the deserts of New Mexico.
E) the continental United States.
A
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Except for 1H and 3He, all nuclei having fewer ______________ than ______________ are radioactive
Fill in the blank(s) with correct word
Which is always true of an uncharged object?
a. It has no charge whatsoever in any part of its structure. b. It has equal amounts of positive and negative charge. c. It is grounded. d. It is not attracted by a charged object. e. It is composed of positively charged electrons and negatively charge protons.
Thin Films: A puddle of water has a thin film of gasoline floating on it. A beam of light is shining perpendicular on the film. If the wavelength of light incident on the film is 560 nm and the indices of refraction of gasoline and water are 1.40 and 1.33, respectively, what must be the minimum thickness of the film to see a bright reflection?
A. 100 nm B. 200 nm C. 300 nm D. 400 nm E. 500 nm
Using current spacecraft, how long would it take to reach the nearest stars?
A) hundreds of thousands of years B) millions of years C) only a few years D) thousands of years