The probability that a hydrogen atom's electron
will be at a certain distance from the proton is
given by
a) the principal quantum number of the electron.
b) the electron's de Broglie wavelength.
c) the binding energy of the electron.
d) the square of the electron's Schrödinger wave function.
d
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A telescope has an angular magnification of 250. when operated with a 20. mm eyepiece. What is the focal length of the objective?
A) 5.0 cm B) 25. meters C) 5000. cm D) 5.0 meters E) 2.5 m
What prevents gravity from pulling you through the ground to the center of the Earth? Choose the best answer
1.The density of matter is too great. 2.The positive nuclei of your body’s atoms repel the positive nuclei of the atoms of the ground. 3.The density of the ground is greater than the density of your body. 4.Atoms are bound together by chemical bonds. 5.Electrons on the ground’s surface and the surface of your feet repel one another.
When only part of the Moon is covered by Earth's full shadow (umbra), we see a(n)
A) total lunar eclipse. B) penumbral lunar eclipse. C) partial lunar eclipse. D) partial solar eclipse. E) annular eclipse.
The banking angle in a turn on the Olympic bobsled track is not constant, but increases upward from the horizontal. Coming around a turn, the bobsled team will intentionally "climb the wall," then go lower coming out of the turn
Why do they do this? A) to give the team better control, because they are able to see ahead of the turn B) to prevent the bobsled from turning over C) to take the turn at a faster speed D) to take the turn at a slower speed E) to reduce the g-force on them