What is the ratio of the speed of infrared and \( \mathrm{P} \) ult...

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What is the ratio of the speed of infrared and
\( \mathrm{P} \)
ultraviolet rays in a vacuum?
W
(1) \( 2: 4 \)
(2) \( 1: 1 \)
(3) \( 1: 2 \)
(4) \( 1: 5 \)
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