In 1924, the French physicist Louis Victor de Broglie
(pronounced as de Broy) (1892-1987) put forward the
bold hypothesis that moving particles of matter should
display wave-like properties under suitable conditions He reasoned that nature was symmetrical and that the
two basic physical entities – matter and energy, must have
symmetrical character If radiation shows dual aspects,
so should matter De Broglie proposed that the wave
length l  associated with a particle of momentum p is
given as
l  = h
h
p
=m v
(11