5 ), l  is smaller for a heavier particle (large m) or
more energetic particle (large v) 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