Here is a YouTube video about Exponential Signals Real and Complex, and is part of a growing collection of videos I have found to be useful. The reason is making sense of exponential signals, both exponential rise and exponential decay. All necessary for understanding DSP algos in SDR radios and understanding science related to software defined radio.
This tutorial, "Exponential Signals Real and Complex" is free education you can watch, which will help you deepen your knowledge and be better prepared for licence exams, schoolwork, or operating radio equipment.