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In the Bohr model, the ratio of the kinetic energy (K) to the potential energy (U) of an electron in the nth orbit is:
1/2
-1/2
1
-1
Which of the following is NOT a limitation of Bohr's model?
It fails to explain the spectra of multi-electron atoms.
It doesn't account for the wave nature of electrons.
It violates the Heisenberg uncertainty principle.
It correctly predicts the energy levels of hydrogen-like species.
The characteristic X-ray spectrum of an element is primarily determined by:
The accelerating voltage of the X-ray tube
The material of the filament
The temperature of the target
The electronic transitions within the target atoms
The intensity of X-rays emitted from a Coolidge tube is primarily controlled by:
The target material
The accelerating voltage
The filament current
The cooling system
In Rutherford's alpha scattering experiment, a thin gold foil was bombarded with alpha particles. Most of the alpha particles passed straight through the foil. This observation suggests that:
The atom is mostly empty space.
Alpha particles are very small.
Gold atoms are very large.
The positive charge of an atom is concentrated in a small volume.
Which of the following is NOT a conclusion drawn from Rutherford's alpha scattering experiment?
The atom is mostly empty space
The atom has a dense, positively charged nucleus
Most of the atom's mass is concentrated in the nucleus
The nucleus contains neutrons
Which of the following transitions in a hydrogen atom emits radiation with the longest wavelength?
n=3 to n=2
n=4 to n=3
n=5 to n=4
n=6 to n=5
In Rutherford's alpha scattering experiment, most of the alpha particles passed straight through the gold foil. This observation suggests that:
Most of the atom is empty space.
Alpha particles are very small.
The gold foil was very thin.
The nucleus is positively charged.
What caused the large deflections of some alpha particles in Rutherford's experiment?
Attraction to electrons
Collision with the gold atoms
Repulsion by a dense, positively charged nucleus
Diffraction by the gold foil
