Correct Answer: De Broglie waves

Solution : The correct answer is De Broglie waves.

De Broglie waves, also known as matter waves, were introduced by the French physicist Louis de Broglie in 1924. De Broglie proposed that particles, such as electrons, and other subatomic particles, can exhibit both particle-like and wave-like properties. This idea was a key development in the early understanding of quantum mechanics and played a crucial role in the development of wave-particle duality.