Bessel function

Okay little kiddo, let me tell you about Bessel functions. Bessel functions are a special kind of math tool that help scientists understand waves, like waves in the ocean or sound waves.

Now imagine you are at the beach and you see a big wave coming towards you. When the wave hits you, you feel a force or pressure on your body. Scientists use Bessel functions to help understand that pressure or force.

Bessel functions were named after a smart man named Friedrich Bessel who studied waves a long time ago. He figured out that Bessel functions can describe the force or pressure from waves in different shapes, like circles or cones, instead of just straight lines.

So when scientists want to understand waves that are shaped like circles or cones, they use Bessel functions to help them find out how strong the force or pressure of the wave will be.

Does that make sense, little one?