A phenomenon that occurs in the ionosphere is
a. the greenhouse effect.
b. photosynthesis.
c. Rayleigh scattering.
d. auroras.
d
Physics & Space Science
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In the critical density universe now proposed, the ratio of dark energy to matter is about
A) 1 to 5. B) 1 to 1. C) 10 to 1. D) 3 to 1. E) 1 to 100.
Physics & Space Science
The center of the Milky Way lies in the direction of the constellation
A) Cygnus. B) Orion. C) Andromeda. D) Sagittarius. E) Virgo.
Physics & Space Science
What is the greatest difference between quantities described by linear and by exponential growth?
What will be an ideal response?
Physics & Space Science
A magnifying glass produces an angular magnification of 7. What is the focal length of this lens if a person whose near point is 28 cm reads a book using this magnifying glass?
A) 2 cm B) 3 cm C) 4 cm D) 5 cm E) 6 cm
Physics & Space Science