Electromagnetic waves are not mechanical waves, which means they can
travel in a:

Vacuum

Explanation:

Concept being tested: Waves and types of waves

To answer the question we need to define both electromagnetic waves and mechanical waves.

Waves can be classified as either electromagnetic waves and mechanical waves based on whether they require a material medium for transmission or not.Electromagnetic waves do not require a material medium for transmission and can travel through a vacuum.Mechanical waves, on the other hand, are waves that require a material medium for transmission.

What are examples of electromagnetic waves and mechanical waves?

Examples of electromagnetic waves include gamma rays, radio waves, visible light, etc.Examples of mechanical waves include sound waves and water waves.

Therefore, the answer to our question is;

Electromagnetic waves are not mechanical waves, which means they can travel in a vacuum.