Quantum Mechanics - Quick integral probability question

In summary, the book explains that the probability of finding an electron within a given volume is represented by the equation ψψ*r^2sinθdθd∅ [1], where ψ is the wavefunction. To find the probability within a specific distance from the nucleus, the equation becomes ∫∫ψψ*r^2sinθdrdθd∅ [2], with the inner integral ranging from 0 to PI and the outer integral from 0 to 2PI. However, there may be a typo in [1] as it does not include dr, which is needed for the volume element r^2sinθdrdθd∅. Additionally, it is unclear why
  • #1
binbagsss
1,254
11
Okay so my book says (the context is electron hydrogen energy levels) the probability of finding the electron within dv=dv(r,∅,θ) is :

ψψ*r^2sinθdθd∅ [1]

where ψ is the wavefunction

And to find within dr of r is : ∫∫ψψ*r^2sinθdrdθd∅,[2] where the inner integral ranges over 0 to PI and the outter from 0 to 2PI

I don't really understand this. Why doesn't the first integral [1] for dv not require dr? As isn't the volume element given by r^2sinθdrdθd∅?

I also don't really understand why we don't need to include some integral limits corresponding to dr in [2]

If anyone can help explain things this would be greatly appreciated . Ta in advance !
 
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  • #2
Looks like a typo to me.
 

1. What is quantum mechanics?

Quantum mechanics is a branch of physics that studies the behavior and interactions of particles at a very small scale, such as atoms and subatomic particles. It describes the probabilistic nature of these particles and their wave-like behavior.

2. What is an integral in quantum mechanics?

In quantum mechanics, an integral is a mathematical tool used to calculate the probability of a particle's location or state. It involves taking the area under a curve in a graph of the particle's wave function.

3. How does quantum mechanics deal with probabilities?

Quantum mechanics uses the concept of a wave function, which represents the probability of a particle being in a certain location or state. The square of the wave function gives the probability density of finding the particle at a specific point.

4. What is the uncertainty principle in quantum mechanics?

The uncertainty principle states that it is impossible to know the exact position and momentum of a particle simultaneously. This is due to the wave-like behavior of particles at the quantum level, where their position and momentum cannot be precisely determined at the same time.

5. How is quantum mechanics applied in real-world situations?

Quantum mechanics has many practical applications, including in the development of technologies such as transistors, computer chips, and lasers. It is also used in fields such as chemistry, biology, and materials science to understand the behavior of particles at a molecular level.

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