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.

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What is the greatest difference between quantities described by linear and by exponential growth?

What will be an ideal response?

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The center of the Milky Way lies in the direction of the constellation

A) Cygnus. B) Orion. C) Andromeda. D) Sagittarius. E) Virgo.

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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