_______________ require that a young hot star (T ? 25,000 K) be relatively nearby
Fill in the blank(s) with correct word
H II regions
H II
You might also like to view...
The critical angle for sapphire surrounded by air is 34.4°. Calculate the polarizing angle for sapphire
a. 60.5° b. 59.7° c. 58.6° d. 56.3°
A small source radiates an electromagnetic wave with a single frequency into vacuum, equally in all directions. As the wave moves, its intensity:
1.increases. 2.decreases. 3.stays constant.
Imagine that it turns out that dark matter (not dark energy) is made up of an unstable form of matter that decays into photons or other forms of energy about 50 billion years from now
Based on current understanding, how would that affect the universe at that time? A) Stars would cease to exist when the dark matter is gone. B) Planetary systems would expand and disperse. C) The galaxies in clusters would begin to fly apart. D) The universe would cease its expansion.
A 1.0 ?F capacitor has a potential difference of 6.0 V applied across its plates. If the potential difference across its plates is increased to 8.0 V, how much ADDITIONAL energy does the capacitor store?
A) 14 ?J B) 28 ?J C) 2.0 ?J D) 4.0 ?J