Exploring the Microscopic World

What is the main reason visible light cannot be used to image molecules?

• Visible light is too bright.

• Visible light is absorbed by molecules.

• The wavelength of visible light is too long.

• Molecules are too large.

How do scanning electron microscopes create images?

• By using sound waves to detect structures.

• By using electrons to outline structures.

• By reflecting visible light off surfaces.

• By capturing heat signatures.

What principle allows particles to act like waves in scanning electron microscopes?

• Law of conservation of energy

• Theory of relativity

• Quantum mechanical principle

• Newton's laws of motion

What significant discovery was made using particle colliders in 1968?

• The speed of light

• The structure of DNA

• The discovery of quarks

• The existence of black holes

What is the Higgs Boson, discovered in 2013, known for?

• Explaining the force of gravity

• Being a type of quark

• Confirming aspects of particle theory

• Being the smallest particle

What is unique about quarks, electrons, and neutrinos?

• They have a large size.

• They are made of smaller particles.

• They are considered elementary particles.

• They can be seen with visible light.

What problem does string theory aim to solve?

• The existence of dark matter

• The infinite forces near point particles

• The speed of light in a vacuum

• The expansion of the universe

What is the Planck length?

• The longest measurable length in the universe

• The size of a proton

• The distance light travels in one second

• The shortest measurable length in the universe

How does string theory describe particles?

• As two-dimensional surfaces

• As four-dimensional spheres

• As three-dimensional cubes

• As one-dimensional loops or strings

What challenge do scientists face when measuring distances at the Planck scale?

• Theoretical limitations of quantum mechanics

• Current technology cannot measure such small distances

• Inability to generate enough energy

• Lack of funding