Electromagnetic radiations propagate in vacuum with a velocity of _______________ metre/second?
Correct answer: B. 3 x 10^8
- A. 3 x 10^5
- B. 3 x 10^8
- C. 3 x 10^10
- D. 3 x 10^12
Explanation
Electromagnetic radiation travels through vacuum at the speed of light, approximately 3 × 10^8 m/s. The smaller values are commonly expressed in centimetres or kilometres per second rather than metres per second.
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