Exam-style question
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Which of the following best describes the propagation of electromagnetic waves?.
- A.They propagate through oscillations of particles in a medium.
- B.They propagate through oscillating electric and magnetic fields.
- C.They require a solid medium to travel.
- D.They are affected by gravity in the same way as sound waves.
Model answer
What a good answer should say
- They propagate through oscillating electric and magnetic fields.
Explanation
Why this works
Electromagnetic waves propagate through space as a result of oscillating electric and magnetic fields. This characteristic allows them to travel through a vacuum, unlike mechanical waves that require a medium.
Common mistake
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