Exam-style question
Try this first
Which of the following statements correctly describes electromagnetic waves?.
- A.Electromagnetic waves require a medium to travel.
- B.Electromagnetic waves can travel through a vacuum.
- C.Electromagnetic waves have a fixed speed that varies with frequency.
- D.Electromagnetic waves are longitudinal waves.
Model answer
What a good answer should say
- Electromagnetic waves can travel through a vacuum.
Explanation
Why this works
This statement is correct because electromagnetic waves do not require a medium to propagate; they can travel through the vacuum of space, unlike mechanical waves.
Common mistake
No common mistake is linked to this question yet.