# String Theory: The de Broglie Hypothesis

At first glance one might expect a length-time wave to have energy associated with it, just like an electromagnetic wave. However, from the preceding arguments it follows that a length-time wave **oscillates between negative and positive energy states of the vacuum**, but averages out to **zero energy**, assuming equal magnitude departures in the opposing energy states. Thus a length-time wave has zero **net** energy. This accords with Louis de Broglie's assertion, in his 1923 note, that matter waves, of themselves, **cannot** involve the transport of energy from place to place. [ ]

## De Broglie Wavelength Hypothesis Overview - ThoughtCo

### De-Broglie hypothesis and De-Broglie equation | …

The de Broglie hypothesis states that particles of matter also had wavelengths and could behave as waves, just as photons did. String theory will later say that both types of particles — matter and energy — are manifestations of vibrating strings, but that’s about 50 years down the road from de Broglie’s time. He proposed his theory in 1923.

### Debroglie hypothesis | Brilliant Math & Science Wiki

Here was de Broglie’s line of reasoning for the bold new theory. Under special relativity, matter and energy were different manifestations of the same thing. The photon, a particle of energy, had a wavelength associated with it. Therefore, particles of matter, such as electrons, should also have wavelengths. His PhD dissertation set out to calculate what that wavelength (and other wave properties) should be.

## De broglie hypothesis ppt by Belkis Killian - issuu

French physicist Louis de Broglie proposed this hypothesis. It was a ground breaking hypothesis in fact. Earlier Louis de Broglie was a student of history, later he built his career in physics. He proposed this famous theory in his PhD thesis in 1924 (some people think the year was 1923).