Why is de-Broglie wave associated with a moving car not visible?

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

Why are de-Brogile waves with a moving football not visible?

Is it possible to observe de -Broglie wave associated with a material particle of 10^(-4) g moving with the velocity of light?Planck's constant is 6.6 xx 10^(-27) erg s.

A electron is accelerated through a potential difference of 100V. What is de-Broglie wavelength associated with it? To which part of the electromagnetic spectrum does this value of wavelength correspond?

Assume that the de Broglie wave associated with an electron can from a standing wave between the atom arrange in a one dimensional array with nodes at each of the atomic sites. It is found that one such standing wave if the distance d between the atoms of the array is 2 A^0 A similar standing wave is again formed if d is increased to 2.5overset @A . Find the energy of the electrons in electron volts and the least value of d for which the standing wave type described above can from .

Find de-Broglie wavelength associated with an electrons moving with velocity 0.6 C. Given, rest mass of electron = 9.1 xx 10^-31 kg , h=6.63 xx 10^-34 Js .

Calculate the number of waves made by a Bohr electyron in one complete revolution in n ^(th) orbit of H-atom, if ratio of de-Broglie wavelength asssociated with electron moving in n^(th) orbit and 2^(nd) orbit is 1.5.

An electron and alpha particle have the same de-Broglie wavelength associated with them. How are their kinetic energies related to each other?