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The speed of electro-magnetic radiation in a vacuum

(1) Increases from radio rays to ?-rays

(2) Decreases from radio rays to ?-rays

(3) Depends upon the source of the radiation

(4) Is equal for all factors or elements

The speed of electro-magnetic radiation in a vacuum (1) Increases from radio rays to ?-rays (2..

( 4 ) Is equal for all factors or elements

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