Will electromagnetic waves pass though walls that light can't?

Answer 1

First of all ... light is electromagnetic waves. But we think we understand what you're asking ...
Can longer or shorter electromagnetic waves get in where light can't ?

Here's a 'thought experiment' that can answer that question:

1). Can you listen to your radio down in a dark part of your basement where there's no sunlight?

2). Can the x-ray machine at the airport check items inside your suitcase or briefcase ?

(Here's a small hint: The answer to both questions is 'Yes'.)

Answer 2

It depends on the type of electromagnetic wave and the material of the wall. Some electromagnetic waves, like radio waves, microwaves, and some types of infrared radiation, can pass through walls that block visible light. However, other types of electromagnetic waves, such as X-rays and gamma rays, are typically blocked by most walls.