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That depends on the type of radiation and sometimes where it comes from. Electromagnetic radiation (gamma rays, xrays, light rays etc) all travel at the speed of light; 3 x 10^8 m/s , regardless of their source. Beta rays & alpha rays are particles and can have any speed , less then the speed of light. Their speed will depend on their source.

radiation (heat) from the sun also travels at the speed of light

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โˆ™ 2011-09-06 12:23:38
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Q: How fast does radiation travel?
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