How long does the protostellar stage last for a star like our Sun?
A) 1 million years
B) 3 million years
C) 10 million years
D) 30 million years
E) 100 million years
D
Physics & Space Science
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In a composite material, the electrical resistivity for current parallel to the axis of the 2nd phase follows the rule of
(a) Mathiessen. (b) Nordheim. (c) Mixtures. (d) Fermi-Dirac.
Physics & Space Science
The top of the stratosphere is called the
a. stratopause. b. tropopause. c. mesopause. d. thermopause.
Physics & Space Science
About 75% of the mass of the visible universe is composed of which element?
a. Helium b. Iron c. Hydrogen d. Silicon
Physics & Space Science
Light is totally absorbed when sent through two polaroid filters if their transmission axes are __________
Fill in the blank(s) with correct word
Physics & Space Science