I understand that radio waves pass through certain material (eg concrete walls), and hence we can receive cellular signals when in an apartment
However lets say I stay in a lower level of a high rise apartment (eg level 3 of a 50 storey tall building) – how does the radio waves penetrate so many walls to reach me? Does the amount of material not matter in this case?
In: Engineering
You need to change how you think about transparancy. Things are not see through or not. Things are see through to certain wavelenghts of light.
For example those black trashbags look opague to your eyes, but they are almost completely see through to infrared.
Same with your walls. They are opague to visible light, but see through to radio waves. Imagine sitting in house with walls and floors out of glass and someone on the lower floors uses a flashlight to morse you a message. That is basically how the world looks from the perspective of radiowaves.
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