Quantum Entanglement & Spooky Action at a Distance

What is "spin" for fundamental particles?

• The actual rotation of the particle.

• A property related to angular momentum and spatial orientation.

• The speed at which a particle travels.

• The magnetic charge of a particle.

When a particle's spin is measured, what happens to its spin?

• The spin always remains the same.

• The spin changes to align with the measurement direction.

• The spin becomes undefined.

• The particle gains energy.

If two entangled particles are measured in the same direction, what will their spins be?

• Both will always be spin up.

• Both will always be spin down.

• They will always have opposite spins.

• They will always have the same spin.

What was Einstein's idea to explain the observed behavior of entangled particles without involving faster-than-light communication?

• The particles were communicating through a wormhole.

• The particles contained hidden information about their spins from the start.

• The measurements were flawed and inaccurate.

• The particles were not truly entangled.

If particles have a "secret plan" where one always spins up and its partner always spins down, what percentage of the time would their measured spins be different?

• 100%

• 75%

• 50%

• 33%

When scientists performed experiments with entangled quantum particles, what percentage of the time did the two detectors show different results?

• 55.6%

• 50.0%

• 48.4%

• 37.1%

What did the experimental results, showing different spins 50% of the time, indicate about the idea of "hidden information" in quantum particles?

• It proved that hidden information exists.

• It showed that hidden information is not present.

• It suggested that particles communicate faster than light.

• It confirmed that particles have a secret plan.

According to quantum mechanics, if one entangled particle is measured as "spin up" in a certain direction, and its partner is measured in a direction 60 degrees away, what is the probability that the partner will also be measured as "spin up"?

• 1/4

• 1/2

• 3/4

• 1/3