Question

Explain why we do not observe quantum effect in case of a fast moving cricket ball?

Answer 1

Explanation:

In quantum mechanics, there is a Correspondence Principle which says that as n (quantum number) approaches infinity, Newton's classical mechanics becomes more correct

In cricket ball, it has to do with wavelength. The higher the momentum of a particle, the shorter its wavelength. A ball has tremendous momentum compared with an electron or photon. Hence its wavelength is small. As wavelengths get smaller, wave-like properties become negligible and particle-like properties dominate.