The speed of all electromagnetic waves in a vacuum is
- A. 3 times 10 to the 8 m per second, whatever their frequency
- B. different for each frequency
- C. 340 m per second
- D. dependent on the intensity
Explanation
In a vacuum every electromagnetic wave from radio to gamma travels at the same speed c, so wavelength and frequency vary inversely. In a material medium the speed falls and does depend slightly on frequency, which is the dispersion that splits white light in a prism. The value 340 m per second is the speed of sound in air.
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