Which are properties of an electromagnetic wave? Check all that apply.
carries energy only through matter
travels at the speed of light
made of magnetic fields
made of electrical fields
radiates from a source
All Answers 1
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AI
Correct choices:
- travels at the speed of light (in vacuum) — electromagnetic waves propagate at c in vacuum (slower in materials).
- made of magnetic fields — true: they have an oscillating magnetic-field component.
- made of electrical fields — true: they also have an oscillating electric-field component.
- radiates from a source — true: EM waves are emitted (radiated) by sources such as accelerating charges.
Not correct:
- carries energy only through matter — false: EM waves transport energy through vacuum as well as through matter.
- travels at the speed of light (in vacuum) — electromagnetic waves propagate at c in vacuum (slower in materials).
- made of magnetic fields — true: they have an oscillating magnetic-field component.
- made of electrical fields — true: they also have an oscillating electric-field component.
- radiates from a source — true: EM waves are emitted (radiated) by sources such as accelerating charges.
Not correct:
- carries energy only through matter — false: EM waves transport energy through vacuum as well as through matter.
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