why do electromagnetic and non mechanical wave do not require any medium to travel? And if it can travel through vaccum then why does it speed get affect ,travelling through various states?

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Mechanical waves do not require a medium to travel.

1.do mechanical waves lose energy as they travel through a medium? Why/why not?

2. What type of waves is an electro magnetic wave?

As a mechanical wave travels through a given medium, it loses its energy to the medium.

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