Quantum Theory: question bank

Q1

FoundationCore practice

In quantum physics, what is the name of the smallest possible unit of any physical property, such as energy or matter?

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Q2

FoundationCore practice

Which scientist first proposed that light energy comes in discrete packets called 'quanta' in 1900, marking the birth of quantum theory?

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Q3

FoundationCore practice

What is the name of the particle that represents a quantum, or packet, of light energy?

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Q4

FoundationStretch

The photoelectric effect shows that shining light below a certain frequency on metal cannot eject electrons, no matter how intense the light is. This demonstrates that light behaves as: a) waves only, b) particles only, c) neither waves nor particles, or d) both wave and particle?

waves onlyparticles onlyneither waves nor particlesboth wave and particle

Q5

FoundationCore practice

What term describes the quantum principle that particles like electrons can behave as waves, and light waves can behave as particles?

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Q6

FoundationCore practice

In quantum mechanics, what does the Heisenberg Uncertainty Principle state we cannot do precisely at the same time for a particle?

Measure its mass and chargeKnow its position and momentum exactlyObserve its color and temperatureDetermine its volume and density

Q7

FoundationCore practice

What is the name of the equation that describes how the quantum state of a system changes over time, developed by Erwin Schrodinger in 1926?

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Q8

FoundationCore practice

In the famous 'Schrodinger's cat' thought experiment, the cat is described as being in what state before observation, illustrating a key quantum concept?

AliveDeadBoth alive and dead simultaneouslyNeither alive nor dead

Q9

FoundationCore practice

What is the Greek word root of 'quantum' and what does it mean?

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Q10

FoundationCore practice

What happens to the energy of an electron when it jumps from a higher energy level to a lower one in an atom?

It absorbs a photonIt emits a photonIt stays the sameIt splits into two electrons

Q11

FoundationCore practice

What is 'quantum superposition' in simple terms?

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Q12

FoundationCore practice

What is the approximate size scale where quantum effects become important?

1 meter (human scale)1 millimeter (grain of sand)1 micrometer (cell size)1 nanometer (atom size)

Q13

FoundationCore practice

In quantum entanglement, when two particles are entangled, measuring one particle's state does what to the other particle's state?

Nothing - they are independentInstantly determines it, even at a distanceDestroys it completelyReverses it to the opposite

Q14

FoundationCore practice

What is a 'quantum bit' or 'qubit' and how does it differ from a regular computer bit?

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Q15

FoundationCore practice

What does the 'collapse of the wave function' mean in quantum mechanics?

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All 61 questions