The diagram above represents energy levels in a hydrogen atom. Each level is labeled with its energy (above the ground state of Level 1) in units of electron/volts (eV). The labeled transitions represent an electron moving between energy levels. Which transition represents an electron that absorbs a photon with 10.2 eV of energy?
A) A
B) B
C) C
D) D
E) E
B) B
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What is the typical number of solar eclipses that occur during a year?
A. one B. zero C. two D. four
If the speed of a car is tripled, the impulse required to stop the car changes by a factor of
A. 3. B. 1/3. C. 1. D. 9. E. 1/9.
One disadvantage of dispersion-strengthened metals at high temperatures is that the dispersion and the matrix are not in _________with each other, and as a result the matrix and dispersion may react with each other.
Fill in the blank(s) with the appropriate word(s).
How fast do the fastest pulsars spin?
A: About 1200 times per second (twice as fast as a blender can go) B: About 600 times per second (fastest speed on a blender) C: About 300 times per second (half the top speed of a blender) D: About 60 times per second E: Exactly once per second, like clockwork