The energy level diagram for hydrogen
The ionization energy of hydrogen is __________.
13.6 eV
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Ice is less dense than liquid water because of ______________ bonding
Fill in the blank(s) with correct word
An engine takes in 150 J energy from a 400 K thermal source. If the engine discharges energy into a thermal reservoir at 150K, then what is the maximum amount of work one can get out of the engine?
A. 93.8 J B. 84.2 J C. 28.5 J D. 168 J
The air that you breathe doesn't emit visible light indicates that most of the electrons of its atoms are
A) in the ground state. B) excited to metastable states. C) relatively cool. D) electrically neutral. E) relatively far apart.
At the time of the vernal equinox
a) the Sun is above the equator moving southward. b) the number of hours of daylight exceeds the number of hours of darkness. c) summer begins for the Northern Hemisphere. d) the Sun is above the equator moving northward.