Quantum Tunnelling

What are the units of Planck's constant?

• N m s

• kg m2 s-1

• J s

• kg m s-2 m s

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

• Δx Δp

• ΔE Δt

• F d t

• ma d t

What does ΔE represent?

• Quantum tunnelling

• Planck's constant

• Lifetime of the particle

• Absolute uncertainty in the Energy of an object

What does Δt represent?

• Lifetime of the particle

• Quantum tunnelling

• Planck's constant

• Absolute uncertainty in the Energy of an object

What is the mathematical relationship between Energy and time?

• ma x d x t = kg m2 s-1

• F x d x t = N m s

• None of the above

• Energy x time = J s

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

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

In a physics class, Lucas learns about quantum tunnelling. What does this concept refer to in the context of quantum particles?

• The ability of a quantum particle to run through walls

• All of the above

• The wave nature of a particle encountering a barrier

• The existence of a particle in a position with insufficient energy