Which statement about electromagnetic waves such as light is correct?
AThey are longitudinal and need a medium
BThey are transverse and travel in vacuum
CThey are transverse and need a medium
DThey are longitudinal and travel in vacuum
Answer & Solution
Correct answer: B. They are transverse and travel in vacuum
The oscillating E and B fields are perpendicular to the propagation direction, and no medium is required.
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