If spin is not included, there are 4 different waves functions correspond to the first excited level n = 2 for hydrogen.
In quantum mechanics, a wave function is a variable quantity that mathematically describes a particle's wave characteristics.
The probability of a particle being present at a given point in space and time is related to the value of the particle's wave function.
Thus, there are 4 different waves functions correspond to the first excited level n = 2 for hydrogen.
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