What is the velocity if, wavelength= 8m and frequency = 20hz

What is the things about?

The radiation of the fire causes the saucepan to heat up. the conduction of the saucepan then to distribute the heat over the saucepan and to give heat to the water. the convection of the water distributing the heat within the water, till all the water is boiling

Is this a question of an answer

That big glowy thing in the sky is called the sun