Unlike mechanical waves, electromagnetic waves can travel through a such as you would in space

vacuum without a material medium for its propagation

Explanation:

Unlike mechanical waves, electromagnetic waves can travel through a vacuum without a material medium for its propagation such as you would in space

Mechanical waves need a medium for its propagation when travelling through a vacuum while electromagnetic wave does not need a material medium for its propagation when travelling through a vacuum.

d.7.5cm is your answer

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