​what is the relationship between the intensity of the Y (gamma) radiation coming from a mono energetic point source and the distance to the source??

Asked Tipi

A uniform chain of length L and mass M is lying on a smooth table and one-third of its length is
hanging vertically down over the edge of the table. If g is acceleration due to gravity, calculate the
work required to pull the hanging part on to the table? Is it zero?

Prateek Singh asked

I have 8 different waves with different amlitudes and different wavelenghts. My difficulty is to specify a mathematical model which defines the superposition of this 8 wave in the way of having maximum amlitude and maximum lenght. I am not a physicist and I have some difficulties in mathematical demonstration. If you could help me, I would be appreciated Best,