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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
If the operating voltage of an X-ray tube is doubled, the minimum wavelength of the emitted X-rays:
Is doubled
Is halved
Remains the same
Is quadrupled
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
In Rutherford's experiment, some alpha particles were deflected at large angles. This observation led to the conclusion that:
Atoms are mostly empty space.
Alpha particles are positively charged.
The positive charge of an atom is concentrated in a small, dense nucleus.
Electrons have negligible mass.
According to Bohr's model, the angular momentum of an electron in the nth orbit is given by:
nh/2ฯ
2ฯ/nh
n/2ฯh
2nh/ฯ
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
