The Bohr model of the hydrogen atom predicts an ionization energy of 13.6 eV. With this model one would expect the ionization energy of the Li++ ion to be
A) 122.4 eV
B) 40.8 eV
C) 54.4 eV
D) 27.2 eV
E) 79.6 eV
A
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What is the function of the receiver antenna of a radio telescope?
a. To absorb the radio energy collected by the dish b. To collect and focus the radiation c. To follow a signal d. To move the telescope e. To control the shape of the dish
Although we know less about dark matter in elliptical galaxies than in spiral galaxies, what does current evidence suggest?
A) Elliptical galaxies probably contain about the same proportion of their mass in the form of dark matter as do spiral galaxies. B) Elliptical galaxies probably contain far less dark matter than spiral galaxies. C) Elliptical galaxies probably contain far more dark matter than spiral galaxies. D) Unlike the broad distribution of dark matter in spiral galaxies, elliptical galaxies probably contain dark matter only near their centers.
Standing at the shore of a still lake, the reflected view of scenery on the other side of the lake is the view you would see if you were upside down with your eye in the line of sight
A) where it already is. B) at the surface of the water where the light reflects. C) directly beneath you, as far below water level as you are above. D) close to the distant shore. E) none of the above
Planetary rings are found around
A) all of the planets B) the planet Saturn only C) all of the Jovian planets D) all of the terrestrial planets