The two concepts that led Niels Bohr to refine the planetary model of the atom are
A. discovery of the nucleus and quantization of energy.
B. properties of electrons and the hydrogen spectrum.
C. discovery of the nucleus and properties of electrons.
D. quantization of energy and the hydrogen spectrum.
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Einstein revolutionized modern physics by ____
a. documenting the existence of gravity through experiments on objects in motion b. proving that Galileo and Newton were fundamentally incorrect about gravity c. explaining how specific gravity impacts the geometry of curved space-time d. providing an explanation of gravity based on the geometry of curved space-time e. defining the difference between violent motion and natural motion
A factory siren indicating the end of a shift has a frequency of 80 Hz. What frequency is perceived by the occupant of a car traveling away from the factory at 30 m/s? The speed of sound in air is 343 m/s
A) 73 Hz B) 75 Hz C) 77 Hz D) 79 Hz E) 81 Hz
The smallest kinetic energy that an electron in a box (an infinite well) can have is zero
A) True B) False
When a light ray meets an interface between two media, the angle of refraction is _______ the angle of incidence.
A. Always less than B. Always greater than C. May be greater than, equal to, or less than D. Equal to