Why are 5G mm wave signals more likely to be blocked by physical barrier such as walls, buildings and trees?

Question: Why are 5G mm wave signals more likely to be blocked by physical barrier such as walls, buildings and trees?

Waves of 5g mm from any type of physical obstruction. For example, this is the main reason behind the building blocks from the walls and from the trees. Because 5g mm waves are too many beads, they get blocked by any kind of physical barrier and or cannot propagate much, so 5g mm waves feel physical barrier. The main reason behind this is because of its high frequency.