Single-Slit Diffraction: A beam of light of wavelength 630 nm is incident on a slit that is 0.400 mm wide. If the distance between the slit and the screen is 1.80 m, what is the width on the screen of the central bright fringe?
A. 1.94 mm
B. 2.94 mm
C. 3.54 mm
D. 5.67 mm
E. 6.94 mm
Answer: D
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The ____________________ is the point on the celestial sphere directly above an observer, regardless of where the observer is located on Earth
Fill in the blank(s) with correct word
In the "Coral Model" of galactic colonization, if we assume that colonizing ships can travel at a few percent of the speed of light, then we might expect all of the habitable planets in the galaxy to be colonized within a few
A) tens of billions of years B) billion of years C) hundred thousand years D) tens of millions of years
Star A is identical to Star B, except that Star A is twice as far from us as Star B. Therefore,
A) both stars have the same luminosity, but the apparent brightness of Star B is twice that of Star A. B) both stars have the same apparent brightness, but the luminosity of Star B is four times that of Star A. C) both stars have the same luminosity, but the apparent brightness of Star A is four times that of Star B. D) both stars have the same luminosity, but the apparent brightness of Star B is four times that of Star A.
How many degrees separate the central meridians that each time zone is based on?
What will be an ideal response?