# Quantum question - angular momentum

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In summary, angular momentum is a fundamental concept in quantum mechanics that describes the rotational motion of a quantum particle. It is measured in units of Planck's constant divided by 2π, denoted as ℏ, and is a conserved quantity in closed systems. Angular momentum also plays a crucial role in determining the energy levels and properties of quantum systems such as atoms and molecules, and can be changed or manipulated through interactions with external forces.

## The Attempt at a Solution

ok so I am trying to solve these three question.. when i understand the method i think i can solve them all.. so please could you help me solve the first 5.3

I understand that Lz = -i d/dphi

but I am not sure how to apply this to the wavefunction to find eigenvalues..

any help would be great!
thanks

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## 1. What is angular momentum in quantum mechanics?

Angular momentum is a fundamental concept in quantum mechanics that represents the rotational motion of a quantum particle. It is a mathematical quantity that describes the amount of rotation a particle has around a given axis.

## 2. How is angular momentum measured in quantum mechanics?

In quantum mechanics, angular momentum is measured in units of Planck's constant divided by 2π, denoted as ℏ (pronounced "h-bar"). This unit is also known as the reduced Planck's constant and has a value of approximately 1.0545718 × 10^-34 joule-seconds.

## 3. What is the significance of angular momentum in quantum mechanics?

Angular momentum is a conserved quantity in quantum mechanics, meaning that it remains constant in a closed system. It also plays a crucial role in determining the energy levels and properties of quantum systems such as atoms and molecules.

## 4. How does angular momentum affect the behavior of particles in quantum systems?

The value of angular momentum can affect the behavior of particles in a quantum system, such as the direction and speed of their rotation. It also determines the shape and orientation of atomic orbitals, which affects the probability of finding a particle in a particular location.

## 5. Can angular momentum be changed or manipulated in quantum systems?

Yes, angular momentum can be changed or manipulated in quantum systems through interactions with external forces such as electromagnetic fields. This can result in changes in the energy levels and properties of the system, and it is an essential aspect of many quantum technologies and applications.