Question

1. what is wave - particle duality?

when sound waves vibrate particles to move.
the idea that light behaves as both a wave and a particle.
waves refracting between different materials.
what happens when a plate is irradiated and ejects an electron.

Explanation:

Wave - particle duality is a fundamental concept in physics. It refers to the property of light (and other quantum entities) that it can exhibit both wave - like characteristics (such as interference, diffraction) and particle - like characteristics (such as the photon concept in the photoelectric effect).

• The first option is about sound waves and particle vibration, which is not related to wave - particle duality.
• The third option is about wave refraction, which is a wave - only phenomenon and not related to wave - particle duality.
• The fourth option is about the photoelectric effect (ejection of electrons when irradiated), which is a part of the evidence for the particle nature of light but does not fully capture the concept of wave - particle duality.

Answer:

The idea that light behaves as both a wave and a particle.