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Quantum Physics: Weirder Than You Think

Quantum physics describes the tiny world of atoms and light, where common sense often fails.

  • Science
  • Adults
  • Medium
  • Educational
  • 10 questions
  • about 5 min
  • Feedback after each question

Against each other

See the questions

Without the right answers, so they're still a surprise when you play.

  1. Question 1

    In quantum mechanics, what counts as an "observation" that affects a system?

    • Only a conscious human looking at it
    • Any interaction that records information
    • Only an observer who knows its true state
    • Only a measurement by a clumsy instrument
  2. Question 2

    What does Heisenberg's uncertainty principle say?

    • Our tools are too crude to measure particles
    • Position and momentum can't both be exactly defined
    • A particle has an exact position we can't learn
    • Measurements always disturb particles by bumping them
  3. Question 3

    Two particles are entangled and far apart. What can entanglement NOT do?

    • Give results that are correlated
    • Send a usable message faster than light
    • Help build quantum computers
    • Be used in real secure communication
  4. Question 4

    According to quantum mechanics, how is an electron in an atom best described?

    • A tiny ball on a fixed circular orbit
    • A particle sitting still at a hidden spot
    • A cloud of probability called an orbital
    • A pure wave with no particle properties
  5. Question 5

    Why did Erwin Schrödinger invent his famous cat thought experiment?

    • To prove cats can truly be alive and dead
    • To show human eyes decide a cat's fate
    • To highlight how absurd quantum rules seem at large scale
    • To design a test later done in real labs
  6. Question 6

    In physics, how big is a "quantum leap" of an electron?

    • Enormous, a huge jump in energy
    • A move between two distant orbits in space
    • Tiny, a jump between energy levels
    • As large as the atom's own nucleus
  7. Question 7

    How does a quantum computer gain its advantage on certain problems?

    • It runs ordinary code at a faster clock speed
    • It simply tries every answer and reads them all
    • Interference boosts right answers and cancels wrong ones
    • Each qubit secretly holds a hidden 0 or 1
  8. Question 8

    In the double-slit experiment, single electrons sent one by one build up what pattern?

    • A random scatter with no pattern at all
    • One bright spot in the middle
    • An interference pattern of many bands
    • Bands only when a person watches
  9. Question 9

    Which everyday technology depends on quantum physics?

    • The spring in a ballpoint pen
    • The transistor in your phone
    • The gears in a bicycle
    • The pulley in a flagpole
  10. Question 10

    What is quantum tunneling?

    • A particle smashing a barrier with great force
    • A particle gaining energy to leap over a barrier
    • A particle crossing a barrier it lacks energy to climb
    • A particle bent around a barrier by imprecise tools
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