Table of Contents

## What is the orthogonality relation for Bessel function?

= −eln ρ = −ρ.

**What is the significance of Bessel function?**

Bessel functions are used to solve in 3D the wave equation at a given (harmonic) frequency. The solution is generally a sum of spherical bessels functions that gives the acoustic pressure at a given location of the 3D space. Bessel function is not only shown in acoustic field, but also in the heat transfer.

### What is the properties of Bessel function?

Bessel functions have many interesting properties: J0(0)=1,Jν(x)=0(if ν>0),J−n(x)=(−1)nJn(x),ddx[x−νJν(x)]=−x−νJν+1(x),ddx[xνJν(x)]=xνJν−1(x),ddx[Jν(x)]=12[Jν−1(x)−Jν+1(x)],xJν+1(x)=2νJν(x)−xJν−1(x),∫x−νJν+1(x)dx=−x−νJν(x)+C,∫xνJν−1(x)dx=xνJν(x)+C.

**What do you understand by Bessel equation?**

Bessel function, also called cylinder function, any of a set of mathematical functions systematically derived around 1817 by the German astronomer Friedrich Wilhelm Bessel during an investigation of solutions of one of Kepler’s equations of planetary motion.

#### What is orthogonality in Fourier series?

The orthogonal system is introduced here because the derivation of the formulas of the Fourier series is based on this. So that does it mean? When the dot product of two vectors equals 0, we say that they are orthogonal.

**What is Bessel function equation?**

Bessel Functions of the First Kind. Recall the Bessel equation x2y + xy + (x2 – n2)y = 0. For a fixed value of n, this equation has two linearly independent solutions. One of these solutions, that can be obtained using Frobenius’ method, is called a Bessel function of the first kind, and is denoted by Jn(x).

## Is Bessel differential equation singular at origin?

The Bessel functions of the second kind, denoted by Yα(x), occasionally denoted instead by Nα(x), are solutions of the Bessel differential equation that have a singularity at the origin (x = 0) and are multivalued.