Why are de-Broglie waves associated with a moving football not visible? The wavelength A, of a photon and the de-Broglie wavelength of an electron have the same value. Show that the energy of the photon is 2λmc/h times the kinetic energy of the electron , where, m,c and h have their usual meanings.

# Why are de-Broglie waves associated with a moving football not visible?

**prasanna**#2

The magnitude of the wavelength of de-Broglie waves associated with a moving football is extremely

small(λ = h / mv < ${{10}^{-34}}$ m) much less than that of visible region and are therefore not visible.

Wavelength of photon = λ

Energy of photon , ${ E }*{ p }$ = hc / λ
Kinetic energy of an electron = , ${ E }*{ e }$ =1/2 m ${{v}^{2}}$