Derive de-Broglie equation.

Explanation

(i) Planck's quantum hypothesis : E = hv
(ii) Einsteins mass-energy relationship :
E = `mc^(2)`
From (i) and (ii)
hn` = mc^(2)`
`hc//lambda= mc^(2)`
`lambda = h //mc`
The equation represents the wavelength of photons whose momentum is given by me (Photons have zero rest mass)
For a particle of matter with mass m and moving with a velocity v, the equation can ve written as