Wave-Particle Duality and the Nature of Light

Professor Dave introduces wave-particle duality, explaining light as both a wave and a particle. He discusses electromagnetic waves, the photoelectric effect, and how Einstein's work on photons and quantum theory revolutionized physics. The video highlights the shift from classical to quantum physics, emphasizing the strange nature of the universe at a small scale.

What is the relationship between wavelength and frequency in light waves?

• They are inversely proportional.

• They are equal.

• They are directly proportional.

• They are unrelated.

What is the speed of light in a vacuum?

• 150 million meters per second

• 300 million meters per second

• 450 million meters per second

• 600 million meters per second

Which part of the electromagnetic spectrum can humans see?

• Gamma rays

• X-rays

• Visible light

• Radio waves

What phenomenon could not be explained by the wave theory of light?

• Reflection

• Refraction

• Photoelectric effect

• Diffraction

What determines the ability of light to eject an electron in the photoelectric effect?

• Intensity of light

• Speed of light

• Frequency of light

• Color of light

Who proposed that energy is quantized?

• Albert Einstein

• Isaac Newton

• Niels Bohr

• Max Planck

What are photons?

• Units of mass

• Atoms of hydrogen

• Particles of light

• Waves of sound

What is the minimum energy required to eject an electron called?

• Planck energy

• Threshold energy

• Quantum energy

• Photon energy

What concept did Einstein introduce to explain the photoelectric effect?

• Wave theory

• Quantum mechanics

• Photon theory

• Relativity

What major shift in physics was brought about by the discovery of wave-particle duality?

• Electromagnetism

• Quantum revolution

• Thermodynamics

• Classical mechanics