a source produces 30 crests and 30 troughs in 3 seconds .when the second Crest is produced the first is 1 cm away from the source. the speed of the wave produced is
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Explaa source produces 30 crests and 30 troughs in 3 seconds .when the second Crest is produced the first is 1 cm away from the source. the speed of the wave produced is
1nation:a source produces 30 crests and 30 troughs in 3 seconds .when the second Crest is produced the first is 1 cm away from the source. the speed of the wave produced is
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