A closed organ pipe produces two successive resonant frequencies at 420 Hz and 540 Hz

PHYSICS · Single correct · A Level · Physics · Waves · Waves

Problem

A closed organ pipe produces two successive resonant frequencies at 420 Hz and 540 Hz. Determine the harmonic numbers corresponding to these two frequencies. (a) 3rd and 5th harmonics3\text{rd and }5\text{th harmonics} (b) 5th and 7th harmonics5\text{th and }7\text{th harmonics} (c) 7th and 9th harmonics7\text{th and }9\text{th harmonics} (d) 9th and 11th harmonics9\text{th and }11\text{th harmonics}

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