Physics Quantum Mechanics

What is the Heisenberg Uncertainty Principle?

• The precise position of a particle can be known but not its momentum

• The precise position and momentum of a particle cannot be known simultaneously

• The precise momentum of a particle can be known but not its position

• The precise position and momentum of a particle can be known simultaneously

What did Niels Bohr suggest about the energy levels of electrons in the hydrogen atom?

• Electrons can exist in energy levels based on their speed

• Electrons can exist in any energy level

• Electrons can only exist in specific energy levels

• Electrons can exist between quantised states

What is the De Broglie wavelength related to?

• The charge of particles

• The mass of particles

• The speed of particles

• The wave nature of particles

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What is the concept of quantum tunnelling related to?

• Particles gaining energy from collisions

• Particles changing their charge

• Particles can exist in a position that, it has insufficient energy to occupy.

• Particles changing their mass

What is the nature of black-body radiation curves according to quantum theory?

• The energy of oscillators is constant

• The energy of oscillators is quantised

• The energy of oscillators is unpredictable

• The energy of oscillators is continuous

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In Bohr atom model which of the quantity is quantized?

• angular momentum

• energy

• linear momentum

• torque

Which pair of quantities obey the uncertainty principle? (Can select more than 1)

• Δx Δp

• ΔE Δt

• F d t

• ma d t

According to classical theory, why should nuclear fusion not take place in the sun?

• Temperatures and pressures are not high enough

• Proton-proton pair does not exist

• Uncertainty in energy is too small

• Strong force is too strong

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According to quantum theory, what allows proton-proton pairs to fuse into deuterium?

• Quantum tunnelling

• Strong force being weak

• Short lifetime and large uncertainty in energy

• High temperatures and pressures

Which row links both the photoelectric effect and electron diffraction to the properties of waves and particles?

• A

• B

• C

• D

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