De Broglie's proposal

**Louis de Broglie**(1892-1987) was a physicist famous for his quantum theories and his terrible haircut.**FUN FACT:**It's pronounced "de Broy"

- In 1923, he published several papers on light quanta and prepared his doctoral thesis, in which he whined that
**nobody has managed to prove whether light was a particle or a wave**. - His stroke of genius came when he equated the
**energy of mass**and the**energy of a wave**

\begin{equation} E = hf | E = mc^2 \end{equation}

(2)
\begin{align} \therefore hf = mc^2 \end{align}

(3)
\begin{align} mc = \frac{hf}{c} \end{align}

(4)
\begin{align} \therefore p = \frac{hf}{c} \end{align}

#### de Broglie's proposal

- Through that he claimed that: "
**All matter has both particle and wavelike properties.** - He developed the idea mathematically, linking all mass with a wavelength known as
**matter waves.** - This wavelength can be found by:

\begin{align} \lambda = \frac{h}{mv} \end{align}

- Where:
- $\lambda$ is the
**"de Broglie wavelength**(m) - h is
**Planck's constant**($6.626 \times 10^{-34}$ - m is the
**mass**of the object (kg) - v is the object's
**velocity**($ms^{-1}$)

- $\lambda$ is the
- de Broglie's proposal revolutionised modern physics and gave birth to the new field of
**quantum physics.**- Quantum Physics was a field where the wave-particle duality of matter is focused on.

- de Broglie's mathematical delvings and his proposal that
**electrons could be diffracted**had great impact on the scientific community. - This new field of physics attracted other major scientists, like Pauli, Heisenberg, Schrodinger, Dirac and others.
- These scientists developed a detailed theory known as
**quantum mechanics**- Quantum mechanics describes a set of physical laws that apply to objects smaller than the size of an atom.

- Also, it is shown later that De Broglie's allowed Bohr's stationary states to be adequately explained.

page revision: 4, last edited: 03 Nov 2011 06:08