NDA 2019 Physics question
Which of the following are the characteristics of electromagnetic waves ? 1. They are elastic waves. 2. They can also move in vacuum. 3. They have electric and magnetic components which are mutually perpendicular. 4. They move with a speed equal to 3 lakh meters per second. Select the correct answer using the code given below :
Answer: (C)
Solution
Electromagnetic waves need no medium and can travel in vacuum (2 correct), and their electric and magnetic fields are perpendicular to each other and to the direction of
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