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The question has no sensible answer: the Mach number is the speed of an object in a medium compared to the speed of sound in the same medium. Light, and other electromagnetic radiation travel fastest in vacuum. Since sound cannot travel in vacuum its speed in vacuum is 0 and so the Mach number for light requires division by zero - which is undefined.

The Mach number for light travelling in air is approx 873,300. In water, it is 202,000 and in diamond it is only 10,400.

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7y ago
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7y ago

The problem is that "Mach" is not very precisely defined; it means, how much faster something moves than the speed of sound. But the speed of sound varies a lot, depending on the material.The speed of light in air is approximately 350 meters/second (it can vary, depending on temperature and pressure); so you may want to use that as a reference. But the speed of sound in other materials is quite different from the speed of sound in air.

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Q: What mach is the speed of light?
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Is mach 20 faster than light If not how much slower?

No, Mach 20 is not faster than the speed of light. The speed of light is approximately 299,792,458 meters per second in a vacuum, while Mach 20 is roughly 7.35 kilometers per second. Therefore, Mach 20 is significantly slower than the speed of light.


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Very much so.


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What is the next speed after mach?

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