Why de broglie waves associated with a moving football are not visible?

Wavelength of the object can only be observed when the wavelength is comparable to the size of the object.

De-broglie wavelength is given by : λ = h/mv

where m is the mass of the object.
 h = planks' constant =6.66×10-34 js 
Since wavelength is inversely proportional to the mass of the object which is too large and h is also very small therefore wavelength will be very small compared to the size of the object.

Hence wavelength of the moving ball can not be seen.
 

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The de broglie wavelength (X) associated with a football of mass 50g and moving with velocity 100m/s (let) is, x = h/mv

x = 6.626x10-34 / (50x10-3 x 100 ) = 1.325 x 10-34

this wavelength is so small that is practically impossible for us to observe.

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