To explain: Why the wave function is not used for describing the macroscopic bodies.
Answer to Problem 40.1DQ
The macroscopic bodies does not possesses wave nature in a physically significant order or they cannot be considered as in a state of wave particle duality and assigning a wave function for a macroscopic body worth no use in describing their state and dynamics. So the wave function is not used for describing the macroscopic bodies such as baseballs and cars.
Explanation of Solution
According to the wave particle duality, every material body is associated with a wave with wavelength given by de Broglie as,
Here,
The wavelength associated with macroscopic bodies is very small and insignificant (in the order of
Conclusion:
Thus, the macroscopic bodies does not possesses wave nature in a physically significant order or they cannot be considered as in a state of wave particle duality and assigning a wave function for a macroscopic body worth no use in describing their state and dynamics. So the wave function is not used for describing the macroscopic bodies such as baseballs and cars.
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Chapter 40 Solutions
University Physics with Modern Physics (14th Edition)