speed of gamma rays in vacuum
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In a vacuum, all electromagnetic waves travel at approximately 3 x 108m/s - the fastest speed possible. When electromagnetic waves travel through matter (for example, light through air or glass), they travel a bit slower than this but rarely less than half as fast as in a vacuum.
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the speed of gamma rays in vacuum is 0.1Angstrom to 100 Angstroms or 0.01 manometer to 10 manometer
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