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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Light is totally absorbed when sent through two polaroid filters if their transmission axes are __________

Fill in the blank(s) with correct word

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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