RE-NEET Physics Waves Class 11 Questions

For sound waves, if the number of nodes for the 5^{th} harmonic of an open-ended pipe is n and that for the 9^{th} harmonic of the same pipe with one of its ends closed is m, the ratio n/m is :

The displacement of a travelling wave y = C sin(2π/λ (at − x)) where t is time, x is distance and λ is the wavelength, all in S.I. units. Then the frequency of the wave is: