Normalization of wave functions

In summary, normalization of wave functions is a crucial process in quantum mechanics that ensures the total probability of finding a particle within a given space equals one. This is achieved by adjusting the wave function so that the integral of its absolute square over all space equals one. Normalization is essential for the physical interpretation of wave functions, as it allows for meaningful probabilistic predictions about the behavior of quantum systems.
  • #1
Nana113
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TL;DR Summary
Is there any properties of normalisation that can be used when encountering superstition of wavefunctions
If wave functions are individually normalized does it mean that they are also normalized if phi 1 and phi 2 are integrated over infinity?

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  • #2
Can you explain your question more clearly?
 
  • #3
The question in the OP cannot be answered, except one has more information on the three wave functions. E.g., if they are orthonormal to each other, then there's a unique answer.

Also the norm in Hilbert space is of course the norm induced by its scalar product. I.e., in position representation, where the Hilbert space is the space of square-integrable functions, this scalar product is defined as
$$\langle \psi_1 | \psi_2 \rangle=\int_{\mathbb{R}} \mathrm{d} x \psi_1^*(x) \psi_2(x),$$
and thus the norm of a wave function is
$$\|\psi \|=\sqrt{\langle \psi|\psi \rangle}, \quad \langle \psi|\psi \rangle=\int_{\mathbb{R}} \mathrm{d} x |\psi(x)|^2.$$
 
  • #4
Nana113 said:
This looks like a homework or exam question. We can't give direct answers to homework or exam questions. We can help somewhat, but you will need to re-post your thread in the appropriate homework forum and fill out the homework template.

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FAQ: Normalization of wave functions

What is normalization of wave functions?

Normalization of wave functions is the process of ensuring that the total probability of finding a particle described by the wave function in all space is equal to one. This is a fundamental requirement in quantum mechanics as it reflects the certainty that the particle must exist somewhere in space.

Why is normalization important in quantum mechanics?

Normalization is crucial because it ensures that the wave function accurately represents a physical probability distribution. Without normalization, the probabilities derived from the wave function would not sum to one, leading to incorrect and non-physical predictions about the behavior of quantum systems.

How do you normalize a wave function?

To normalize a wave function, you integrate the square of its absolute value over all space and set this integral equal to one. Mathematically, for a wave function ψ(x), this means solving the integral ∫|ψ(x)|² dx = 1. If the integral is not equal to one, you adjust the wave function by multiplying it with an appropriate normalization constant.

What happens if a wave function is not normalized?

If a wave function is not normalized, the probabilities calculated from it will be incorrect. This can lead to predictions that do not make physical sense, such as probabilities greater than one or less than zero. In practical terms, it means the wave function does not correctly describe the quantum state of the system.

Can all wave functions be normalized?

Not all wave functions can be normalized. For a wave function to be normalizable, it must be square-integrable, meaning the integral of its absolute square over all space must be finite. Some wave functions, such as those describing free particles with infinite extent, cannot be normalized in the usual sense and require special treatment, such as using delta functions or considering them within a finite volume.

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