Neutral hydrogen atoms are best studied from their energy given off as
A) 21-cm waves in the radio region.
B) 0.2 nm as X-rays.
C) 121.3 nm as Lyman alpha emission in the UV.
D) red hydrogen alpha emission, at 656.3 nm.
E) Neutral hydrogen gives off no detectable radiation, since it is cold, not hot.
A
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Capacitors of values 1.0 F, 2.0 F, 3.0 F, and 6.0 F are connected in series across a 12 V power supply. Which capacitor has the greatest charge on it?
A. the 1.0 F capacitor B. the 2.0 F capacitor C. the 3.0 F capacitor D. the 6.0 F capacitor E. they are all equal
Evidence for a very early "super rapid" inflation of the universe is that the 3-K radiation from opposite sides of the sky (i.e., 180 degrees or about 28 billion light years apart) is of nearly ___________ intensity. Time for light to travel this distance is ___________ the age of the universe in years
a. equal; greater than b. unequal; greater than c. equal; less than d. unequal; less than
How do we account for the great variety of substances in the world?
A) The Earth is 4.5 billion years old.
B) Most of these substances are organic compounds.
C) Atoms are incredibly small.
D) There are many possible combinations of atoms.
Synthetic compounds that can be molded and hardened are called ______________
Fill in the blank(s) with correct word