Quantum Mechanics I - SS3 Physics Past Questions and Answers - page 1
1
Which of the following is a fundamental postulate of quantum mechanics?
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A
Energy is conserved
B
Momentum is conserved
C
The position and momentum of a particle cannot both be known exactly
D
The velocity of light is constant
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2
Which of the following best describes the principle of superposition in quantum mechanics?
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A
The combination of two or more waves to form a new wave
B
The interference of waves resulting in cancellation or reinforcement
C
The ability of a particle to exist in multiple states simultaneously
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D
The bending of waves around an obstacle or through an opening
3
What is an atomic orbital?
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A
The path an electron takes around the nucleus
B
The region around an atomic nucleus where an electron is most likely to be found
C
The number of protons in an atomic nucleus
D
The energy required to remove an electron from an atom
4
Which of the following is a consequence of the Heisenberg uncertainty principle?
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A
The energy of a particle is conserved
B
The momentum of a particle is conserved
C
The position and momentum of a particle cannot both be known exactly
D
The velocity of light is constant
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6
What are the applications of quantum mechanics?
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7
What is wave-particle duality?
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A
The idea that particles can exist as both waves and particles simultaneously
B
The idea that particles can only exist as waves
C
The idea that particles can only exist as particles
D
The idea that waves can only exist as particles
8
The uncertainty principle states that:
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A
The position and momentum of a particle cannot both be precisely known at the same time
B
The energy and time of a particle cannot both be precisely known at the same time
C
The spin and angular momentum of a particle cannot both be precisely known at the same time
D
The mass and velocity of a particle cannot both be precisely known at the same time
9
What is the de Broglie wavelength?
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A
The wavelength of a particle
B
The wavelength of a wave
C
The wavelength of a photon
D
The wavelength of a nucleus
10
Which of the following experiments supports the wave-particle duality?
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A
The double-slit experiment
B
The photoelectric effect
C
The Stern-Gerlach experiment
D
The Franck-Hertz experiment
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