A metal rod of 1m length, is dropped exact vertically on to a hard metal floor. With an oscilloscope, it is determined that the impact produces a longitudinal wave of 1.2k Hz frequency. The speed of sound in the metal rod is :

1. A. 600 m/s
2. B. 2400 m/s
3. C. 1800 m/s
4. D. 1200 m/s

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