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The frequencies of two successive higher harmonics of a standing sound wave in a closed-closed tube...

The frequencies of two successive higher harmonics of a standing sound wave in a closed-closed tube is 450 Hz and 600 Hz. There are no other frequencies in between these two. What are the frequencies of the fundamental (1st harmonic) and the second harmonic of this tube? Draw the standing wave pattern (with respect to pressure variation) of the second harmonic. Mark the nodes and anti-nodes.

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