The calculation of electron energy levels in the hydrogen atom was done first by
a. Schrödinger.
b. de Broglie.
c. Bohr.
d. Heisenberg.
c
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A thin lens of focal length 20 cm is placed in contact with a 40-diopter thin lens. What is the power of the combined lenses?
a. 1/4 diopter b. 35.0 diopters c. 45.0 diopters d. 80 diopters e. 4 diopters
The background stars during a solar eclipse are those of constellations
A) of the opposite season. B) seen in the nighttime sky. C) not seen normally. D) seen in the opposite hemisphere.
A positive magnetic susceptibility is due to an applied magnetic field orienting electron _________in the direction of the applied magnetic field.
Fill in the blank(s) with the appropriate word(s).
When a solid is changed to a liquid, the solid
A) releases energy. B) absorbs energy. C) both of these D) neither of these