For example, the de Broglie wavelength
of a ball of mass 0 12 kg moving with a speed of 20 m s–1 is easily
calculated:
LOUIS VICTOR DE BROGLIE (1892 – 1987)
Louis Victor de Broglie
(1892 – 1987) French
physicist who put forth
revolutionary idea of wave
nature of matter This idea
was developed by Erwin
Schródinger into a full-
fledged theory of quantum
mechanics 
commonly
known as wave mechanics In 1929, he was awarded the
Nobel Prize in Physics for his
discovery of the wave nature
of electrons