Finding Frequency Transparency: What Info Do You Need?

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To determine if a frequency can travel through an object, understanding the object's material properties is crucial. Higher and longer wavelengths generally penetrate materials better than shorter wavelengths. Key information includes the object's index of refraction, which varies by material and frequency. For visible and infrared light, absorption frequencies can be calculated based on molecular bonds, while for microwaves and radio frequencies, conductivity and material thickness are important factors. Analyzing these elements helps predict frequency transparency effectively.
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I was wondering if someone could give me a formula/explanation in how to find out if a given frequency will travel through an object or some sort...

I believe higher as well as longer wavelengths have better chances of going through something than the reverse. Any ideas??

What information would you need from the object? Index of Refraction??
 
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It depends on the materialand frequency.

For visible/infrared light and a transparent material you can work out the absorption frequncies from the bonds.

For microwave/radio you can work out an approximation from the conductivity and material thickness.
 

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