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17 January, 04:59

The hammering on a train track is often heard twice by workers farther down the track; first as the sound travels through the steel

and second as the sound travels through the air. This suggests which graph is true?

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  1. 17 January, 07:21
    0
    Graph D

    Explanation:

    The speed of sound in steel or any solid is faster than the speed of sound through air. This means the steel bar on the graph graph should be the larger of the two.
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