- #1

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- 32

1. I don't understand what ψ (

**r**)= <

**r**|ψ> means. What is the difference between the wavefunction ψ and the ket |ψ> ?

2. A similar equation is ψ (

**p**) = <

**p**|ψ>. Is this ket |ψ> the same as the one above or is it expressed in terms of

**p**instead of

**r**?

3. Momentum

**p**=[itex]\hbar[/itex]

**k**; so if

**k**is quantised as in the infinite square well why is

**p**not quantised ?